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The noise shaping circuit performs the integration and scale conversion on digital signals output by the first quantizer, performs the scale conversion on digital signals output by the second quantizer, and then adds up and outputs the converted signals. The Sigma-Delta analog-to-digital converter eliminates quantizing noise of the first-order Sigma-Delta modulation circuit and can improve SNR signal to noise ratio and reduce total harmonic distortion by cascading two Sigma-Delta modulation circuits of second order or more than two order and then performing noise shaping on signals output by the second-order Sigma-Delta modulation circuits.

A kind of sigma-Delta analog-to-digital converter Technical field. The object of the present invention is to provide a kind of total harmonic distortion little, the high sigma-Delta analog-to-digital converter of precision. The present invention is achieved in that a kind of sigma-Delta analog-to-digital converter, and this transducer comprises: the first order sigma-Delta modulation circuit that comprises the 1st and the 2nd adder, the 1st and the 2nd integrator, the 1st quantizer, 1DA transducer;.

The second level sigma-Delta modulation circuit that comprises the 3rd and the 4th adder, the 3rd and the 4th integrator, the 2nd quantizer, 2DA transducer;. Another road signal is input to adder 26, arithmetic unit 25 is the devices that carry out transformation of scale to from the digital signal of quantizer 22 outputs, it makes from the digital signal of quantizer 22 outputs and becomes k2 doubly, be input to adder 26, adder 26 is with another road signal and the signal plus of exporting from arithmetic unit Adder 27 is supplied with lead-out terminal 30 with the signal of adder 26 outputs and the signal plus of integrator 15 outputs;.

Described the 1st adder deducts the analog signal of described 1DA transducer output from the analog signal by the outside input;. Described the 1st integrator carries out integration to the analog signal of described the 1st adder output;. Described the 2nd adder deducts the analog signal of described 1DA transducer output from the analog signal of described the 1st integrator output;. Described the 2nd integrator carries out integration to the analog signal of described the 2nd adder output;.

The corresponding digital signal of analog signal of described the 1st quantizer output and the output of described the 2nd integrator;. The corresponding analog signal of digital signal of described 1DA transducer output and the output of described the 1st quantizer is entered into the described the 1st and the 2nd adder;.

Described the 3rd adder deducts the analog signal of described 2DA transducer output from the analog signal of described the 2nd integrator output;. Described the 3rd integrator carries out integration to the analog signal of described the 3rd adder output;. The corresponding digital signal of analog signal of described the 2nd quantizer output and the output of described the 4th integrator;.

The corresponding analog signal of digital signal of described 2DA transducer output and the output of described the 2nd quantizer is entered into the described the 3rd and the 4th adder;. Described noise shaping circuit carries out integration and transformation of scale with the digital signal of described the 1st quantizer output, and the digital signal of the 2nd quantizer output is carried out transformation of scale, and the signal plus after the conversion is exported. In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.

Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention. In Fig. Adder 2 will be deducted by the analog signal of input terminal 1 input the analog signal by 28 outputs of DA transducer, and 4 pairs of analog signals from adder 2 outputs of integrator are carried out integration.

Adder 5 deducts the analog signal by 28 outputs of DA transducer from the analog signal by integrator 4 outputs. The digital signal that quantizer 8 outputs are corresponding with the analog signal of exporting from integrator 7. The corresponding analog signal of digital signal of 28 outputs of DA transducer and quantizer 8, and be entered into adder 2,5. Arithmetic unit 3 is the devices that carry out transformation of scale to from the analog signal of adder 2 outputs, and it makes from the analog signal of adder 2 outputs and becomes a1 doubly, is input to integrator 4.

Arithmetic unit 6 is the devices that carry out transformation of scale to from the analog signal of adder 5 outputs, and it makes from the analog signal of adder 5 outputs and becomes a3 doubly, is input to integrator 7. Arithmetic unit 12 is the devices that determine from quantizer 8 to adder 2 analog feedback amount, and it makes the analog signal of DA transducer 28 outputs become b1 doubly, is input to adder 2.

Arithmetic unit 13 is the devices that determine from quantizer 8 to adder 5 analog feedback amount, and it makes the analog signal of DA transducer 28 outputs become b2 doubly, is input to adder 5. Arithmetic unit 14 is the devices that carry out transformation of scale to from the analog signal of integrator 7 outputs, and it makes from the analog signal of integrator 7 outputs and becomes k doubly, is input to adder Adder 16 deducts the analog signal by 29 outputs of DA transducer from the analog signal by arithmetic unit 14 outputs, 18 pairs of analog signals from adder 16 outputs of integrator are carried out integration.

Adder 19 deducts the analog signal by 29 outputs of DA transducer from the analog signal by integrator 18 outputs. The digital signal that quantizer 22 outputs are corresponding with the analog signal of exporting from integrator The corresponding analog signal of digital signal of 29 outputs of DA transducer and quantizer 22, and be entered into adder 16, Arithmetic unit 17 is the devices that carry out transformation of scale to from the analog signal of adder 16 outputs, and it makes from the analog signal of adder 16 outputs and becomes c1 doubly, is input to integrator Arithmetic unit 20 is the devices that carry out transformation of scale to from the analog signal of adder 19 outputs, and it makes from the analog signal of adder 19 outputs and becomes c3 doubly, is input to integrator Arithmetic unit 23 is the devices that determine from quantizer 22 to adder 16 analog feedback amount, and it makes the analog signal of DA transducer 29 outputs become d1 doubly, is input to adder Arithmetic unit 24 is the devices that determine from quantizer 22 to adder 19 analog feedback amount, and it makes the analog signal of DA transducer 29 outputs become c2 doubly, is input to adder Another road signal is input to adder 26, and arithmetic unit 25 is the devices that carry out transformation of scale to from the digital signal of quantizer 22 outputs, and it makes from the digital signal of quantizer 22 outputs and becomes k2 doubly, is input to adder Adder 26 is with another road signal and the signal plus of exporting from arithmetic unit Connect and share knowledge within a single location that is structured and easy to search.

I'm having some difficulty understanding the frequency response of a charge mode amplifier, circuit shown in Figure 1 below. I believe I understand the principles behind an charge mode amplifier circuit, however I'm rather confused about the frequency response. Considering Figure 1 above, my understanding is that R1 and Cf will act as a low pass filter, where frequencies above a specific cutoff frequency related to values of R1 and Cf will be attenuated.

However, having had a read through a Texas Instruments TI PDF 2 discussing this type of circuit, the frequency response doesn't appear to follow this rule I was expecting a low pass filter response. The circuit and frequency response described by TI is shown in Figure 2 below. Your first circuit is an integrator.

It ideally puts the pole at zero, so there's no "corner frequency" as such The second schematic adds Rf, which plays against Cf to give you a low-pass pole. I think they switched the high-pass and low-pass formulae on the frequency response chart. When a charge amplifier is used, the output from the piezoelectric sensor is current which the charge amp integrates to produce an output voltage which is proportional to the charge generated by the sensor.

It is the charge generated by the piezoelectric sensor which is proportional to the sensor's stimulating force. The integral of current is charge. A voltage amplifier could be used instead to amplify the voltage output from the piezo electric sensor but only if the cable between the sensor and voltage amplifier is short.

This is because cable capacitance will attenuate a voltage mode signal. The charge amplifier's integrator has the response of a single pole, active, low pass filter with a pole at:. Rf must be kept very large in value so that the integrater integrates well down to low frequencies.

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Modified 22 days ago.

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The charge amplifier's integrator has the response of a single pole, active, low pass filter with a pole at: wc = 1/(Rf*Cf). Although the filter provides low pass (LP), high pass (HP) and band pass (BP) As a result, separate transfer functions for each individual output with. Performance testing in a standard magnet shows that the proposed integrator, which has an integration time constant of 10 ms, has a low integration drift (<5 mV).