| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 141 | Bias voltage controlled parallel active components | US09082735 | 1998-05-21 | US06301467B1 | 2001-10-09 | Esko Järvinen; Jukka Varis |
| The course of an oscillating signal is controlled in mutually alternative first active component (31) and second active component (32), both of which can be set into active state by a certain first value of a control signal brought to the component and which are in inactive state with a certain second value of the control signal. The signal is directed to pass through the first active component (31) by setting it into active state by a control signal (33) brought to it. At the same time, the second active component (32) is prevented from affecting the course of the signal by setting a control signal brought to it to a second value (107, 111). | ||||||
| 142 | Dual forward and reverse test points for amplifiers | US09170866 | 1998-10-13 | US06198498B1 | 2001-03-06 | John W. Brickell |
| A communication system (100) processes forward signals generated by headend equipment (105) and reverse signals generated by subscriber equipment (135). A communication medium (110, 120), such as fiber optic cable or coaxial cable, couples the headend equipment (105) and the subscriber equipment (135), and amplifiers (400) are positioned at various locations along the medium (110, 120) to amplify the forward and reverse signals. The amplifiers (400) include a dual forward/reverse test circuit (FIG. 5) having a forward test point (406) coupled to the forward signal, a reverse test point (408) coupled to the reverse signal, and a single directional coupler (404) connected to the forward test point (406), for providing the forward signal thereto, and to the reverse test point (408), for providing the reverse signal thereto. | ||||||
| 143 | Bidirectional amplifier | US647815 | 1996-05-15 | US5821813A | 1998-10-13 | Robert Alexander Batchelor; John William Archer |
| A bidirectional amplifier has first and second two-terminal ports each capable of acting as either an input or an output for said amplifier. A field effect type transistor is connected in common gate mode with the common (or grounded) terminal of each of said ports being at least AC connected with the gate of said transistor, and the source and drain of said transistor being respectively connected to a corresponding one of the other terminals of said ports via an impedance matching device. | ||||||
| 144 | Variable gain amplifier apparatus | US547120 | 1995-10-23 | US5625321A | 1997-04-29 | Kazuji Sasaki; Masayuki Katakura; Kazuyuki Saijo |
| In a variable gain amplifier apparatus, wide input dynamic range can be secured and low noise characteristic can be obtained by employing first and second variable gain amplifiers have different noise characteristics and different saturation input levels and receive a same input signal. Output signals of the first and second variable gain amplifiers are added to each other to provide an output signal of the variable gain amplifier apparatus. Desired noise characteristic and saturation input level characteristic of the variable gain amplifier apparatus can be obtained by selecting the noise characteristics and the saturation input levels of the first and second variable gain amplifiers appropriately. This allows the variable gain amplifier apparatus to have a wide input dynamic range and low noise characteristic. | ||||||
| 145 | Transmission control circuit for use in TDMA communication devices | US158664 | 1993-11-29 | US5493705A | 1996-02-20 | Takeshi Tanemura |
| A transmission control circuit for use in a TDMA communication device controls the rise and fall characteristics of driving voltages applied to high-frequency amplifier circuits in such a way that the generation of unnecessary waves at the time of transmission can be restrained to a minimum, wherein a driving voltage ON/OFF circuit B1 outputs first and second driving voltages S1 and S2 having different rise and fall time constants, the first driving voltage S1 being supplied to a first high-frequency amplifier circuit A1, and the second driving voltage S2 to a second high-frequency amplifier circuit. The requisite rise time for the driving voltage S1, which is supplied to the first high-frequency amplifier circuit A1, is longer than the requisite rise time for the ON/OFF switching signal S2, supplied to the second high-frequency amplifier circuit A2, and the requisite fall time for the driving voltage S1 is shorter than the requisite fall time for the second ON/OFF switching signal S2, which is supplied to the second high-frequency amplifier circuit A2. | ||||||
| 146 | Device and method for bi-directional amplification with a JFET | US515450 | 1990-04-27 | US5057791A | 1991-10-15 | Mark W. Thompson; Donald R. Martz; George D. Helm |
| A bi-directional amplifier having two symmetrical and versatile impedance matching circuits with a JFET therebetween, and a method for bi-directional amplification using a JFET. Each junction of the JFET may be a drain or a source depending on the direction of amplification. Each impedance matching circuit provides a low impedance for the junction that is a source and a high impedance for the junction that is a drain. The impedance is varied by adding a first capacitor parallel to a resonating inductor and a second capacitor, which is removed or inserted in series with the load, responsive to the direction of amplification. The frequency of the signal being amplified may be different for each direction. | ||||||
| 147 | Transceiver modules for phased array antenna | US444191 | 1989-11-30 | US5027084A | 1991-06-25 | Toshikazu Tsukii |
| A transceiver module includes a bi-directional amplifier having a pair of symmetric signal paths for amplification of both transmit and receive signals is described. The amplifier is a bi-directional amplifier and includes a pair of symmetric signal paths. The amplifier is disposed between a pair of r.f. switches to provide a pair of signal paths between two terminals of the module. A phase shifter is coupled between on of the terminals of the module and one of the r.f. switches, wherein the second terminal of the module is coupled directly to the other one of the pair of switches. | ||||||
| 148 | Bidirectional transconductance amplifier | US7717 | 1987-01-28 | US4689607A | 1987-08-25 | Jeffrey I. Robinson |
| An apparatus for converting an input voltage into a related output current, is disclosed and generally comprises: a resistance means in series with the voltage input; first and second double output current mirrors, wherein each output of the first double output mirror is connected to a corresponding output of the second double output mirror, and the inputs of the double output current mirrors are connected; and an operational amplifier with the inverting input connected to ground, the noninverting input connected to the resistance means, and the op amp output connected to the inputs of the first and second double output mirrors, wherein first outputs of the first and second double output mirrors are connected to the noninverting input of the operational amplifier, and the second outputs of the first and second double output mirrors are connected to the output current. The disclosed transconductance amplifier is advantageously used to transform an input voltage into an input current for a continuous time analog to digital converter which uses current steering techniques. | ||||||
| 149 | Impedance matching using active couplers | US239340 | 1981-03-02 | US4386242A | 1983-05-31 | Harold Seidel |
| Circuitry (100) for providing impedance compensation between a source impedance (501) and a load impedance (505) which is proportional to the source impedance comprises: a pair of directional couplers (200 and 300), each coupler including bidirectional transmitting and receiving paths and a unidirectional path coupling these paths; means (121) for cascading the transmit path of one coupler to the receive path of the other; and unidirectional amplifier (400) for interconnecting the remaining bidirectional transmission ports. The impedance match to the source is obtained by adjusting the amplifier gain in correspondence to the number of essentially identical terminations that are bridged to form the load impedance. Means (510-515) sense the number of active terminations and transmit this information to the amplifier so the appropriate gain setting may be established. | ||||||
| 150 | Alternating voltage amplifier circuit having a plurality of semiconductor amplifier elements operated in a grounded gate or grounded base configuration | US127958 | 1980-03-07 | US4342968A | 1982-08-03 | Gerhard Ritter |
| An alternating voltage amplifier circuit has a plurality of semiconductor amplifier elements, preferably field effect transistors, operated in a grounded gate (base) configuration. The amplification direction is not to be determined until the application of specific operating voltages and is reversible by means of reversing such voltages. At least two semiconductor amplifier elements are provided in parallel to one another. One of the semiconductor amplifier elements is effective in one direction of amplification as an input amplifier and, with the other semiconductor amplifier element, in the other amplification direction has a power amplifier, the other semiconductor amplifier element being connectible or disconnectible upon reversal of the amplification direction. | ||||||
| 151 | Method and apparatus for amplifying signal transmission through transmission lines | US32678573 | 1973-01-26 | US3818151A | 1974-06-18 | CHAMBERS C; KIKO F |
| A circuit for increasing the amplitude of signals transmitted through a two-wire transmission line. Amplifying voltage generating means generates and introduces in series with the transmission line an amplifying voltage that varies in accordance with the signal voltage across the transmission line. Amplifying current generating means generates and introduces in shunt with the transmission line an amplifying current that varies in accordance with the signal current through the transmission line. Gain control means varies the ratio of amplifying voltage to signal voltage and the ratio of amplifying current to signal current, as a function of frequency, to provide frequency compensated gain and impedance matching for each frequency in the band of frequencies to be transmitted through the transmission line.
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| 152 | Two way repeater | US3586793D | 1968-06-21 | US3586793A | 1971-06-22 | NEAL JOHN C |
| A two-way two-wire repeater is disclosed comprising two oppositely directed amplifiers coupled to a transmission line. The repeater is provided with a series capacitor and diode connected to feed a portion of the signal at the output of a stage of one amplifier to the input of a stage of the oppositely directed amplifier. This feed-across path eliminates the need for ''''hybrid coil'''' coupling by deforming amplifier oscillation into pulses and permitting the pulses to be amplitude or height modulated.
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| 153 | Pulse transfer system | US3573635D | 1968-11-18 | US3573635A | 1971-04-06 | COSTA DONALD J DA |
| Two groups of terminals are interconnected by circuitry which transfers a pulse from any one terminal of the first group to all terminals of the second group and vice versa. Each terminal is connected to a common transfer system through an individual amplifier circuit which permits simultaneous bidirectional pulse transfers. The amplifiers are arranged to inhibit transfers of signals from one terminal of a group to the remaining terminals of the same group.
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| 154 | Negative impedance device | US46360165 | 1965-06-14 | US3384844A | 1968-05-21 | MEACHAM LARNED A |
| 155 | Amplifier with two channels for two-way speech connection | US35220264 | 1964-03-16 | US3324256A | 1967-06-06 | LENNART SKOOG KARL IVAN |
| 156 | Polarity sensing amplifier circuit | US83637459 | 1959-08-27 | US2985774A | 1961-05-23 | CARBONE VICTOR T; CLARK JR RUSSELL D |
| 157 | Koenig | US2733303D | US2733303A | 1956-01-31 | ||
| 158 | Transistor system for translating signals in two directions | US29959852 | 1952-07-18 | US2691073A | 1954-10-05 | LOWMAN RODERIC V |
| 159 | Electrical transmission system including bilateral transistor amplifier | US21263951 | 1951-02-24 | US2662123A | 1953-12-08 | KOENIG JR WALTER |
| 160 | Bidirectional transistor amplifier | US9767749 | 1949-06-07 | US2659774A | 1953-11-17 | BARNEY HAROLD L |
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