Switched capacitor adjustable gain amplifier with high gain and low noise

A gain amplifier, switched capacitor technology, applied in switched capacitor control, gain control, amplification control, etc., can solve the problems of increasing chip power consumption, increasing cost, increasing the area required for the chip, etc., and achieving the effect of high magnification

Active Publication Date: 2020-08-18
苏州真感微电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The result must be a significant increase in chip area and cost
[0016] 2. If the capacitances of 108 and 104 increase at the same time, the power consumption will also increase at the same time, because the charge and discharge current require

Method used

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  • Switched capacitor adjustable gain amplifier with high gain and low noise
  • Switched capacitor adjustable gain amplifier with high gain and low noise
  • Switched capacitor adjustable gain amplifier with high gain and low noise

Examples

Experimental program
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Effect test

Embodiment 1

[0041] A high-gain, low-noise switched capacitor adjustable gain amplifier, such as figure 2 As shown, including: external signal source, square wave generator with frequency division function, switched capacitor integrator and feedback circuit with signal amplification function, external signal source is connected to switched capacitor integrator, and square wave generator is used to generate frequency division The control clock signal is given to the switched capacitor integrator, and the switched capacitor integrator outputs through the feedback circuit.

[0042] Among them, the switched capacitor integrator includes 7 CMOS switches turned on by positive pulses, sampling capacitor 104, adjustable feedback capacitor 108 and integrating capacitor 102, the feedback circuit includes operational amplifier 111, and the CMOS switches turned on by positive pulses All are connected to the square wave generator, including the first COMS switch tube 103, the second COMS switch tube 1...

Embodiment 2

[0059] Such as Figure 4 As shown, it is a switched capacitor adjustable gain amplifier with a fully differential structure. Its principle is the same as that of the PGA circuit with single-ended output, but it is more practical because of its symmetrical structure.

[0060] The fully differential switched capacitor adjustable gain amplifier includes an external signal source, a square wave generator with frequency division function, a switched capacitor integrator and a fully differential output operational amplifier 331, the external signal source is connected to the switched capacitor integrator, and the square wave is generated The device is used to generate a frequency division control clock signal to the switched capacitor integrator, and the switched capacitor integrator outputs through the fully differential output operational amplifier;

[0061] Wherein, the external signal source includes a differential mode input signal source 301 and a common mode input signal sour...

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PUM

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Abstract

The invention provides a switched capacitor adjustable gain amplifier with high gain and low noise. The switched capacitor adjustable gain amplifier comprises an external signal source, a square wavegenerator, a switched capacitor integrator and a feedback circuit with a signal amplification function, wherein the external signal source and the square wave generator are connected to the switched capacitor integrator, the switched capacitor integrator outputs through the feedback circuit, the switched capacitor integrator comprises seven COMS switching tubes opened by forward pulses, a samplingcapacitor, an adjustable feedback capacitor and an integrating capacitor, and the feedback circuit comprises an operational amplifier. According to the switched capacitor adjustable gain amplifier, the time-reduced integrated frequency of the feedback capacitor is equivalent to the reduction of the capacitance value of the feedback capacitor; the noise of the PGA is reduced while the high gain isrealized; meanwhile, the layout area of the circuit is not increased, the power consumption and the cost are reduced, the detection precision and the detection efficiency of the circuit are improved,and the switched capacitor adjustable gain amplifier is suitable for various sensor interfaces, signal conditioning chips and signal links and has a great market development prospect in automotive electronics, white household appliances, industrial automation and the Internet-of-things.

Description

technical field [0001] The invention relates to the field of integrated circuit design, in particular to a high-gain and low-noise switched capacitor adjustable gain amplifier. Background technique [0002] A switched capacitor adjustable gain amplifier (programmable gain amplifier, PGA) is often used in sensor signal detection, analog-to-digital signal conversion (ADC) and digital-to-analog (DAC) conversion circuits. However, the currently commonly used switched capacitor PGA circuit usually increases the ratio of the input capacitor and the feedback capacitor of the switched capacitor amplifier when achieving a higher gain, or uses a method of cascading two switched capacitor amplifiers. The former achieves high gain while amplifying the noise of switched capacitors a lot, while the latter is insufficient in terms of power consumption and occupied chip area. [0003] Such as figure 1 The commonly used single-ended output switched capacitor PGA is shown as an example. The...

Claims

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Application Information

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IPC IPC(8): H03G3/30
CPCH03G3/30H03G3/008Y02D30/70
Inventor 王磊
Owner 苏州真感微电子科技有限公司
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