US 2017/0250697 A1 · A/D CONVERTER CIRCUIT AND SEMICONDUCTOR INTEGRATED CIRCUIT

Abstract

An analog-to-digital converter circuit having a simple design and capable of preventing an increase in surface area and other problems. An analog-to-digital converter circuit for converting an analog input signal to a digital quantity includes an analog-to-digital converter unit that converts analog input signals to pre-correction digital values, and a corrector unit that digitally corrects the pre-connection digital values output from the analog-to-digital converter unit. The corrector unit includes a weighting coefficient multiplier unit that outputs a post-correction digital value obtained by multiplying the weighting coefficients provided for each bit by each bit of the pre-correction digital value output from the A/D converter unit and summing them, and a weighting coefficient search unit that searches for weighting coefficients so as to minimize an error signal generated based on the post-correction digital value and an approximate value for the post-correction digital value.

Claims20

Dependent claims

An analog-to-digital converter circuit that converts an analog input signal into a digital quantity comprising:

an analog-to-digital converter unit that converts the analog input signal into a pre-correction digital value;
and
a corrector unit that digitally corrects the pre-correction digital value,
wherein the corrector unit includes:
a weighting coefficient multiplier unit that outputs a post-correction digital value obtained by multiplying weighting coefficients provided for each bit by each bit of the pre-correction digital value and summing them, and
a search vector generator unit that generates search vectors based on each bit of the pre-correction digital value and an approximate value of each bit of the pre-correction digital value, and
an error signal generator unit that calculates error signals based on the post-correction digital value and an approximate value of the post-correction digital value, and
a weighting coefficient search unit that searches for the weighting coefficients based on the search vectors and the error signals.

5 more elements

A wireless receiver comprising:

an antenna,
a frontend module that outputs an RF signal that is received at the antenna,
a low noise amplifier that amplifies the RF signal,
an oscillator circuit that generates a local oscillator signal,
a mixer that converts the RF signal into a baseband signal by multiplying the RF signal with the local oscillator signal,
a programmable gain amplifier that amplifies the baseband signal to a desired signal level,
a low-pass filter that removes an external band interference wave from the baseband signal, and
an analog-to-digital converter circuit that performs A/D conversion of the baseband signal from an analog signal to a digital signal,
wherein the analog-to-digital converter circuit comprises:
an analog-to-digital converter unit that converts the analog signal into a pre-correction digital value;
and
a corrector unit that digitally corrects the pre-correction digital value output from the analog-to-digital converter unit,
wherein the corrector unit comprises:
a weighting coefficient multiplier unit that outputs a post-correction digital value obtained by multiplying weighting coefficients provided for each bit by each bit of the pre-correction digital value output from the analog-to-digital converter unit and summing them, and
a weighting coefficient search unit that searches for weighting coefficients so as to minimize an error signal generated based on the post-correction digital value and an approximate value for the post-correction digital value.

12 more elements

Dependencies are inferred from the claim text.

A/d converter circuit and semiconductor integrated circuit

Life of this patent

A/d converter circuit and semiconductor integrated circuit

Life of this patent

Abstract

Claims20