Time-shared instantaneous gain-ranging amplifier
阅读：11发布：2022-08-06
专利汇可以提供Time-shared instantaneous gain-ranging amplifier专利检索，专利查询，专利分析的服务。并且One-hundred low-frequency analog signal channels having a very large dynamic range, may be amplified to at least half of full scale a 14 bit analog to digital converter without distortion by an amplifier system that includes an instantaneous gain-ranger, a preamplifier for each channel, a filter system for each channel, a premultiplexer gain-ranging amplifier for each channel, and a multiplexer. The instantaneous gain-ranger consists of a series of binary amplifier stages, threshold detecting circuitry and logic circuitry. The output is taken from the first unsaturated amplifier. The preamplified and premultiplexer gain-ranging amplifier are connected into the system ahead of the multiplexer and provide a sufficient signal-to-noise ratio to mask the noise introduced into the system by the multiplexer. The output of the system is typically digitized.，下面是Time-shared instantaneous gain-ranging amplifier专利的具体信息内容。
1. A time-shared instantaneous gain-ranging amplifier system, comprising: 1. a plurality of data input channels, each channel including a preamplifier and a premultiplexer gain-ranging amplifier operatively conneCted to said preamplifier, each such amplifier including means for generating a digital signal indicating the gain state of such amplifier; 2. multiplexer switch means having a plurality of inputs and a single output, each of said inputs being operatively connected to receive the output of one of said premultiplexer gainranging amplifiers, said multiplexer switch means being adapted to sequentially connect each of said premultiplexer gainranging amplifiers to the output of said multiplexer switch means; 3. means for varying the gain of each of the premultiplexer gain-ranging amplifiers in response to the individual signal levels at the output of each of said amplifiers prior to the multiplexer switch means; 4. an instantaneous gain-ranging amplifier connected to the output of said multiplexer switch means, said instantaneous gain-ranging amplifier having a plurality of cascaded relatively low-amplification gain stages, an output circuit and means for instantaneously connecting a given gain stage to said output circuit in response to the input signal level, the output of the amplifier system having a maximum amplitude level and the output of said instantaneous gain-ranging amplifier being selected to cause the output of the system to remain near said maximum level, gain coding means attached to said instantaneous gain-ranging amplifier and adapted to create a digital output signal indicating the gain level of said instantaneous gain-ranging amplifier; and 5. output means including an analog-to-digital converter connected to receive the output of the instantaneous gainranging amplifier and to produce a digital representation thereof, and including means connected to receive the digital signals from the premultiplexer gain-ranging amplifiers and the digital output signal from the gain coding means to produce a digital representation of the total system gain associated with the output of the instantaneous gain-ranging amplifier at a given time.
2. multiplexer switch means having a plurality of inputs and a single output, each of said inputs being operatively connected to receive the output of one of said premultiplexer gain-ranging amplifiers, said multiplexer switch means being adapted to sequentially connect each of said premultiplexer gain-ranging amplifiers to the output of said multiplexer switch means;
2. A time-shared instantaneous gain ranging amplifier system, comprising:
2. multiplexer switches having a plurality of inputs and a single output, each of said inputs being operatively connected to one of said premultiplexer gain-ranging amplifiers, said multiplexer switches being adapted to sequentially connect each of said premultiplexer gain-ranging amplifiers to the output of said multiplexer switches;
3. means for varying the gain of each of the premultiplexer gain-ranging amplifiers in response to the individual signal levels at the output of each of said amplifiers prior to the multiplexer switches;
3. means for varying the gain of each of the premultiplexer gain-ranging amplifiers in response to the individual signal levels at the output of each of said amplifiers prior to the multiplexer switch means;
3. The apparatus of claim 2 further characterized by a digital word output buffer connected to the output of said analog to digital converter and said means for combining, said digital word output buffer being adapted to format the output of said means for combining and the output of said analog to digital converter into a single digital word indicating the normalized absolute value of the output of said instantaneous gain-ranging amplifier and the total gain of the amplifier system.
4. The apparatus of claim 3 wherein said filter means consists of an anti-alias filter.
4. an instantaneous gain-ranging amplifier connected to the output of said multiplexer switch means, said instantaneous gain-ranging amplifier having a plurality of cascaded relatively low-amplification gain stages, an output circuit and means for instantaneously connecting a given gain stage to said output circuit in response to the input signal level, the output of the amplifier system having a maximum amplitude level and the output of said instantaneous gain-ranging amplifier being selected to cause the output of the system to remain near said maximum level, gain coding means attached to said instantaneous gain-ranging amplifier and adapted to create a digital output signal indicating the gain level of said instantaneous gain-ranging amplifier; and
4. a sample and hold means connected to the output of said multiplexer;
5. an instantaneous gain-ranging amplifier connected to the output of said sample and hold means, said instantaneous gain-ranging amplifier having a plurality of cascaded 6 db gain stages, an output circuit and means for instantaneously connecting a given gain stage to said output circuit in response to the input signal level, whereby the output of said instantaneous gain-ranging amplifier remains within one digital bit of the maximum output signal level on an analog-digital converter; said premultiplexer gain-ranging amplifier including means for generating a digital signal indicating the gain state of said amplifier; means for generating a gain code attached to said instantaneous gain-ranging amplifier and adapted to create a digital out-put signal indicating the gain level of said instantaneous gain-ranging amplifier; means for combining the digital gain code of said premultiplexer gain-ranging amplifier and said instantaneous gain-ranging amplifier into a single digital word indicating the total gain of the amplifier system, said meaNs for combining being operatively attached to both the digital signal generating means of said premultiplexer gain-ranger and said gain coding matrix.
5. output means including an analog-to-digital converter connected to receive the output of the instantaneous gain-ranging amplifier and to produce a digital representation thereof, and including means connected to receive the digital signals from the premultiplexer gain-ranging amplifiers and the digital output signal from the gain coding means to produce a digital representation of the total system gain associated with the output of the instantaneous gain-ranging amplifier at a given time.
5. The apparatus of claim 4 further characterized by a low pass and high pass filter inserted between the output of said preamplifier and said anti-alias filter.
6. The apparatus of claim 5 wherein said instantaneous gain-ranging amplifier comprises: a plurality of precision 6 db gain amplifier stages Al through An; an analog output bus; Switches SO through Sn, said switches respectively connecting the output of said amplifier stages Al through An to said analog output bus, said switch SO connecting the input to amplifier Al to said analog output bus; a plurality bipolar threshold detector and logic circuits TO through Tn, said threshold detectors respectively connected to the output of amplifiers Al through An threshold detectors and TO connected to the input of amplifier Al, said comparitors being adapted to detect the threshold respectively on the output of said amplifiers and to generate an output signal whenever said threshold is exceeded in either a positive or negative direction; said logic circuits having one input coming from their respective bipolar threshold detector and a second input coming from the bipolar threshold detector having one greater index number, the output of said logic circuits being connected to and adapted to close the respective switch and thereby connect said analog output bus with the output of said respective amplifier when the following logic equation is satisfied: Sk XkXk l a gain coding matrix having inputs O through n connected one to each of the outputs of said logic circuits, said gain coding matrix being adapted to generate a 4-bit digital output word characterizing the gain stage of said instantaneous gain-ranging amplifier.
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