Low supply Class AB output amplifier
AssigneeIntel IP Corporation
InventorJohn G. Kauffman
Life of this patent
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Abstract
An apparatus is provided which comprises: a differential input amplifying stage including a current source and a first node; a first matched pair of transistors coupled to the first node, wherein one of the transistors of the first matched pair is coupled to an output node of a driving stage; a second matched pair of transistors coupled to a second node to bias the second matched pair of transistors, wherein one of the transistors of the second matched pair of transistors is coupled to the output node of the driving stage, and wherein the second node is to be charged according to a first bias of the current source; and a resistive device coupled to the first and second nodes.
Claims18
An apparatus comprising:
- an integrator;
- an analog-to-digital converter (ADC) coupled to an output of the integrator, wherein the ADC comprises a class AB amplifier having class AB biasing, wherein the AB amplifier comprises a differential amplifier stage and a current sense circuitry coupled to the differential amplifier stage;
- and
- a digital-to-analog converter (DAC) coupled to the ADC and the integrator,
- wherein the differential amplifier stage comprises a differential input amplifier having n-type devices, and
- wherein the current sensing circuitry is to regulate an output quiescent current of the n-type devices.
A system apparatus comprising:
- an antenna;
- an integrated circuit (IC) coupled to the antenna, wherein the IC includes:
- a first integrator;
- a first analog-to-digital converter (ADC) coupled to an output of the first integrator, wherein the first ADC comprises a class AB amplifier having class AB biasing, wherein the AB amplifier comprises a differential amplifier stage and a current sense circuitry coupled to the differential amplifier stage;
- and
- a first digital-to-analog converter (DAC) coupled to the first ADC and the first integrator;
- a second integrator;
- a second ADC coupled to an output of the second integrator, wherein the second ADC comprises a class AB amplifier having class AB biasing;
- and
- a second DAC coupled to the second ADC and the second integrator;
- and
- a memory coupled to the IC.
An apparatus comprising:
- a differential input amplifier including a current source and a first node;
- a matched pair of devices coupled to the first node, wherein one of the devices of the matched pair is coupled to an output node of a driving circuitry;
- and
- a resistive device coupled to the first node.
Dependencies are inferred from the claim text.