ANALOG TO DIGITAL CONVERTER WITH INVERTER BASED AMPLIFIER
First Claim
1. An analog-to-digital converter (“
- ADC”
), comprising;
an input terminal configured to receive an analog input voltage signal;
a first ADC stage coupled to the input terminal and configured to output a first digital value corresponding to the analog input voltage signal and a first analog residue signal corresponding to a difference between the first digital value and the analog input signal;
a first inverter based residue amplifier configured to receive the first analog residue signal, amplify the first analog residue signal, and output a first amplified residue signal;
a second ADC stage configured to receive the first amplified residue signal and output a second digital value corresponding to the first amplified analog residue signal and output a second analog residue signal corresponding to a difference between the second digital value and the first amplified analog residue signal;
a second inverter based residue amplifier configured to receive the second analog residue signal, amplify the second analog residue signal, and output a second amplified residue signal;
a third ADC stage configured to receive the second amplified residue signal and output a third digital value corresponding to the second amplified analog residue signal; and
a controller coupled to the first, second and third ADC stages and configured to combine the first, second and third digital values into a digital output signal representing the analog input voltage signal.
1 Assignment
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Accused Products
Abstract
An analog-to-digital converter (“ADC”) includes an input terminal configured to receive an analog input voltage signal. A first ADC stage is coupled to the input terminal and is configured to output a first digital value corresponding to the analog input voltage signal and a first analog residue signal corresponding to a difference between the first digital value and the analog input signal. An inverter based residue amplifier is configured to receive the first analog residue signal, amplify the first analog residue signal, and output an amplified residue signal. The amplified residue signal is converted to a second digital value, and the first and second digital values are combined to create a digital output signal corresponding to the analog input voltage signal.
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Citations
20 Claims
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1. An analog-to-digital converter (“
- ADC”
), comprising;an input terminal configured to receive an analog input voltage signal; a first ADC stage coupled to the input terminal and configured to output a first digital value corresponding to the analog input voltage signal and a first analog residue signal corresponding to a difference between the first digital value and the analog input signal; a first inverter based residue amplifier configured to receive the first analog residue signal, amplify the first analog residue signal, and output a first amplified residue signal; a second ADC stage configured to receive the first amplified residue signal and output a second digital value corresponding to the first amplified analog residue signal and output a second analog residue signal corresponding to a difference between the second digital value and the first amplified analog residue signal; a second inverter based residue amplifier configured to receive the second analog residue signal, amplify the second analog residue signal, and output a second amplified residue signal; a third ADC stage configured to receive the second amplified residue signal and output a third digital value corresponding to the second amplified analog residue signal; and a controller coupled to the first, second and third ADC stages and configured to combine the first, second and third digital values into a digital output signal representing the analog input voltage signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- ADC”
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10. An analog-to-digital converter (“
- ADC”
), comprising;an input terminal configured to receive an analog input voltage signal; a first ADC stage coupled to the input terminal and configured to output a first digital value corresponding to the analog input voltage signal and a first analog residue signal corresponding to a difference between the first digital value and the analog input signal; a first inverter based residue amplifier configured to receive the first analog residue signal, amplify the first analog residue signal, and output a first amplified residue signal, wherein the first inverter based residue amplifier includes; a first amplifier stage having an input inverter coupled between first and second voltage terminals, the first stage inverter configured to receive the first analog residue signal; a second amplifier stage having first and second inverters coupled between the first and second voltage terminals and configured to receive an output of the first amplifier stage, and corresponding first and second control devices configured to control current flow through the first and second inverters in response to a control signal; a third amplifier stage including an output inverter coupled between the first and second voltage terminals and configured to receive an output of the second amplifier stage; and a control circuit coupled to the first and second control devices and configured to generate the control signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
- ADC”
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18. A method, comprising:
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sampling an analog input voltage signal during a first operation phase; disabling an inverter based residue amplifier during the first operation phase; converting the analog input voltage signal to a first digital value corresponding to the analog input voltage signal during a second operation phase; determining a first analog residue signal corresponding to a difference between the first digital value and the analog input signal during the second operation phase; amplifying the first analog residue signal by the inverter based residue amplifier during a third operation phase; converting the amplified first analog residue signal to a second digital value corresponding to the amplified first analog residue signal; and combining the first and second digital values to a digital output signal representing the analog input voltage signal. - View Dependent Claims (19, 20)
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Specification