Continuous Time Integral Delta Analog-to-Digital Converter

Abstract

A continuous time integrating triangular analog-to-digital converter includes a first integral for integrating the difference between a first differential signal derived from the differential analog input signal and a second differential signal derived from the quantized output signal. stage, a quantizer, and a low-pass filter. The first integrator stage has a differential operational amplifier, first, second, third and fourth input resistors and a first pair of integrating capacitors. The differential analog input signal is received at the first and second input nodes of the converter, and the first and third input resistors are connected in series between the first input node and the first input terminal of the operational amplifier. The second and fourth input resistors are connected in series between the second input node and the second input terminal of the operational amplifier. The first and second input resistors are respectively connected in series with the third and fourth input resistors.

Description

[0001] Cross references to related applications [0002] This application claims priority to US Provisional Application 61 / 435,012 (filed January 21, 2011), which is hereby incorporated by reference in its entirety. technical field [0003] The disclosed embodiments of the present invention generally relate to electronic devices, and more particularly, to oversampled continuous-time oversampled delta analog-to-digital converter (continuous-time oversampled converter). Background technique [0004] The difference between a continuous-time analog-to-digital converter (CT ADC) and a discrete-time analog-to-digital converter (DT ADC) is that the continuous-time analog-to-digital converter Instead of sampling in its front-end circuitry, the continuous-time ADC applies some form of filtering or Analog processing. Continuous-time ADCs have several advantages over discrete-time ADCs, such as better immunity to coupled noise and lower power consumption. In addition, for continuou...

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Problems solved by technology

In addition, under the condition that a large number of consumer markets continue to promote the integration level of a single chip, the coupling noise between various functional blocks on a single chip also makes designers must pursue critical mixed-signal circuits with higher noise immunity.

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