3 results about "Successive approximation ADC" patented technology

This invention relates to a digital calibration method and system for analog-to-digital converters (ADCs) based on an affine projection algorithm, belonging to the field of analog integrated circuits. Taking a split-type successive approximation ADC as an example, the method includes: obtaining the output difference between the first and second ADCs to be calibrated and defining it as an error signal; constructing a projection input matrix and an error vector based on the error signal and the digital code values ​​corresponding to the most recent P conversions; using an affine projection algorithm to output first and second update parameters to update the calibration parameters; and continuously updating the calibration parameters to make the performance indicators of the ADC to be calibrated continuously approach the ideal performance indicators until the error is within the allowable range. This invention constructs a projection input matrix from the digital code values ​​obtained from the current and several historical conversions, and adaptively updates the calibration parameters based on the affine projection algorithm, thereby achieving faster convergence and suppressing oscillations even when the input code pattern correlation is strong.

The application discloses a kind of based on the transconductance capacitance type residual amplification method and device of cycle operation, belong to integrated circuit design technical field.Transconductance capacitance type residual amplification device includes: based on the transconductance capacitance amplifier and amplifier bias circuit of cycle operation;Adopt odd-even cycle discharge technology, odd cycle and even cycle are alternately carried out cycle discharge and amplification cooperation, realize equivalent gain promotion under low voltage;At the same time, even cycle reduces power consumption by reducing supply voltage;Again adopt tail resistance linearization technology, inhibit the transconductance change in cycle amplification process;The application can more simply construct high-precision, medium-speed pipeline successive approximation ADC under the constraint of low voltage, low power consumption, applicable to industrial internet of things, intelligent sensor and portable medical monitoring and other energy efficiency requirements strict application scenarios, and need and digital chip deep combination system level design.

The application discloses a multi-bit quantization discrete sigma-delta modulator and method based on capacitor multiplexing, and belongs to the field of analog-to-digital conversion in analog integrated circuits. The multi-bit quantization discrete sigma-delta modulator based on capacitor multiplexing comprises an integrator module, a P-terminal comparator module, an N-terminal comparator module, a SAR logic module, a P-terminal capacitor array module, an N-terminal capacitor array module, a P-terminal switch array module and an N-terminal switch array module. The application forms a full-differential quantizer by connecting two single-ended successive approximation ADCs in parallel, multiplexes the capacitive DAC of the single-ended successive approximation ADC, realizes the quantization function and the feedback function in the sigma-delta modulator, and improves the modulation precision of the modulator. The application can reduce the number of capacitors required by the multi-bit quantization discrete sigma-delta modulator, thereby reducing the power consumption of the switched capacitor network and the layout area of the modulator.