Tuneable microelectronic active band-pass filter专利检索-LC滤波器信号处理专利检索查询-专利查询网

Tuneable microelectronic active band-pass filter

阅读：810发布：2022-11-21

专利汇可以提供Tuneable microelectronic active band-pass filter专利检索，专利查询，专利分析的服务。并且A microelectronic or integrated circuit active band-pass filter uses only resistors, capacitors, and active devices, is stable and has filter characteristics equivalent to an LC band-pass filter. A known band-pass amplifier comprises an operational amplifier and a negative feedback tuneable RC band reject network, such as a twin-T or bridged-T notch filter, or parallel high- and low-pass filters. To this is added a positive feedback circuit including an adjustable attenuator (for Q control) and a series feedback capacitor, and also a series input capacitor, that are effectively tuned to resonance at the band reject network center frequency. The positive feedback circuit thus has inductive characteristics at the passband frequencies, with resulting Q enhancement. The pass bandwidth and center frequency or high- and low-pass frequencies are tuneable independently and electronically by preferably fabricating the attenuator and band reject network in distributed RC form using insulated gate field effect transistors.，下面是Tuneable microelectronic active band-pass filter专利的具体信息内容。

权利要求

1. A tuneable active band-pass filter comprising an amplifier having a substantially constant gain over a selected frequency range, an amplifier negative feedback circuit including a tuneable frequency-selective network that is formed only of resistive and capacitive components and has a rejection band within the selected frequency range, an amplifier positive feedback circuit formed only of resistive and capacitive components and including the series combination of an adjustable attenuator and a feedback capacitor, and an input capacitor coupled to said amplifier and also coupled to said positive feedback circuit to effectively form a series Resonant circuit, the combination of said input capacitor and positive feedback circuit being effectively tuned to resonance at a frequency within the rejection band of said frequency-selective network, whereby said positive feedback circuit has inductive characteristics at the passband frequencies and the active band-pass filter has steeply sloped filter characteristics.

2. A circuit as defined in claim 1 wherein said frequency-selective band rejection network has a center frequency, and further includes control means for tuning the center frequency, the combination of said input capacitor and positive feedback circuit being tuned to resonance at the center frequency.

3. A circuit as defined in claim 1 wherein said frequency-selective band rejection network comprises a high-pass filter and a low-pass filter, and control means for independently tuning the high-pass frequency and the low-pass frequency of the respective high-pass and low-pass filters.

4. A circuit as defined in claim 3 wherein said frequency-selective network formed of only resistive and capacitive components is voltage controlled to change at least one of the effective resistance and capacitance, and said control means for independently tuning the high-pass frequency and the low-pass frequency are control voltages.

5. A tuneable microelectronic active band-pass filter comprising an operational amplifier having differential input terminals and an output terminal, and a substantially constant gain over a selected frequency range, a negative feedback circuit connected between the amplifier output terminal and one input terminal and including a tuneable frequency-selective network formed only of resistive and capacitive components that has a rejection band within the selected frequency range, a positive feedback circuit formed only of resistive and capacitive components that is connected between the amplifier output terminal and other input terminal and includes the series combination of an adjustable attenuator and a feedback capacitor, and an input capacitor effectively coupled in series circuit relationship with said positive feedback circuit to effectively form a series resonant circuit, the series combination of said input capacitor and positive feedback circuit being effectively tuned to series resonance at a frequency within the rejection band of said frequency-selective circuit, whereby said positive feedback circuit has inductive characteristics at the passband frequencies resulting in enhanced Q and steeply sloped filter characteristics.

6. A circuit as defined in claim 5 wherein said frequency selective band rejection network is formed at least partially of resistive and capacitive components in distributed form comprising insulated gate field effect transistors, and control means for tuning said frequency-selective network comprising at least one control voltage for varying the gate-to-substrate voltage of said insulated gate field effect transistors, and wherein said adjustable attenuator is a resistive voltage divider comprising a fixed resistor and an insulated gate field effect transistor, and control means for adjusting said attenuator comprising a control voltage for varying the gate-to-substrate voltage of said last-mentioned insulated gate field effect transistor.

7. A circuit as defined in claim 5 wherein said adjustable attenuator is a resistive voltage divider comprising an insulated gate field effect transistor, and said feedback and input capacitors have the same capacitance value, and the product of the overall circuit gain and attenuation constant is selected to have a value of two.

8. A circuit as defined in claim 5 wherein said frequency selective band rejection network comprises the parallel combination of a high pass filter and a low pass filter each constructed of at least one insulated gate field effect transistor, and means for independently tuning the high pass frequeNcy and the low pass frequency comprising control voltages for independently varying the gate-to-substrate voltages of the transistors respectively forming said high pass filter and low pass filter.

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Tuneable microelectronic active band-pass filter

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