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Analog signal sampling circuit and switch capacitance circuit
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A sampling circuit and analog signal technology, applied in the electronic field, can solve the problems of signal distortion and inability to achieve high linearity sampling, etc., and achieve the effect of high linearity
Active Publication Date: 2014-12-31
BEIJING VIMICRO ARTIFICIAL INTELLIGENCE CHIP TECH CO LTD
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However, in the above-mentioned sampling circuit, since the conduction voltage of the sampling switch (that is, the voltage between the gate and the source) is related to the input signal and changes with the input signal, the conduction resistance of the sampling switch also changes with the signal. Causes the sampled signal to be distorted, and high linearity sampling cannot be achieved
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Embodiment 1
[0042] refer to Figure 4 , shows a structural diagram of an analog signal sampling circuit described in the embodiment.
[0043] The analog signal sampling circuit described in this embodiment includes switches SW4, SW5, capacitors Cs, Cint and operational amplifier A1, wherein:
[0044] The switch SW4 is controlled by the clock PH1, one end is connected to the node n1, and the other end is connected to the reference voltage;
[0045] The switch SW5 is controlled by the clock PH2, one end is connected to the node n1, and the other end is connected to the inverting input end of the operational amplifier A1;
[0046] The non-inverting input terminal of the operational amplifier A1 is connected to the reference voltage, and the integrating capacitor Cint is connected in parallel between the inverting input terminal and the output terminal;
[0047] Capacitor Cs is connected between node n1 and node n2 as a sampling capacitor;
[0048] The analog signal sampling circuit also i...
Embodiment 2
[0074] This embodiment will describe a switched capacitor circuit of the present invention in detail.
[0075] Switched capacitor circuits usually use MOS technology, the process is relatively simple, and it is easy to integrate on a large scale, so it has developed rapidly in the field of electronic technology and is widely used in various integrated circuits, such as filter circuits, integrating circuits and sampling circuit etc. At present, the accuracy of signal processing in integrated circuits is getting higher and higher. Therefore, the requirements for switched capacitor circuits in practical applications are also getting higher and higher, especially for the linearity of circuits. Sometimes, it is also required to process input signals lower than the lowest voltage in the circuit.
[0076] The switched capacitor circuit of the present invention, by setting a voltage constant module, can make the voltage value between the gate and the source of the switch constant whe...
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Abstract
An analog signal sampling circuit is provided. The circuit has high linearity and can process the signal lower than the lowest voltage in the circuit. The analog signal sampling circuit generates a constant voltage by setting a voltage constant module as the voltage between the gate and the source when p-type metaloxidesemiconductorfield effecttransistor (PMOSFET) tube used as the switching tube is turned on. The voltage between the gate and the source is kept constant and not changed with the change of the input signal when the PMOSFET tube is in the turn-on state, so that the turn-on resistance of the PMOSFET tube is also not changed with the change of the input signal, thus providing the PMOSFET tube with constant turn-on resistance, and reducing the distortion of the signal through the PMOSFET tube. The sampling circuit realizes high linearity sampling. A switching circuit is also provided.
Description
technical field [0001] The invention relates to the field of electronic technology, in particular to an analog signal sampling circuit and a switched capacitor circuit. Background technique [0002] Switched Capacitor Circuit (Switched Capacitor Circuit) is a circuit basically composed of a switch and a capacitor controlled by a clock signal; it uses the storage and transfer of charges to realize various processing functions for signals. In actual circuits, sometimes the circuits based on switches and capacitors cannot meet the requirements, so switched capacitor circuits are often combined with amplifiers or operational amplifiers, comparators, etc. to realize the generation, transformation and processing of electrical signals. [0003] In common analog signal sampling circuits, sample and hold circuits usually use MOS switched capacitor circuits to implement various signal processing functions, for example, figure 1 The sampling circuit shown. In the usual CMOS process, ...
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Patent Type & Authority Patents(China)
IPC IPC(8): G11C27/02H03K17/687
CPCG11C27/026
Inventor 龚川
Owner BEIJING VIMICRO ARTIFICIAL INTELLIGENCE CHIP TECH CO LTD
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