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US 10,506,318 B2Granted
System and method for signal read-out using source follower feedback
AssigneeInfineon Technologies AG
InventorsFrancesco Polo, Richard Gaggl
Life of this patent
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Abstract
In accordance with an embodiment, a circuit includes an amplifier and a programmable capacitor coupled between an output of the first non-inverting and the input of the first amplifier.
Claims24
A system comprising:
- a first AC coupling capacitor comprising a first signal terminal, a second signal terminal, and a first parasitic terminal, wherein the first AC coupling capacitor has a first capacitance between the first signal terminal and the second signal terminal and a second capacitance between the second signal terminal and the first parasitic terminal, wherein the second capacitance is a parasitic capacitance of the first AC coupling capacitor;
- a first amplifier having an input coupled to the first signal terminal of the first AC coupling capacitor and an output coupled to the first parasitic terminal of the first AC coupling capacitor;
- and
- a first programmable capacitor coupled between the output of the first amplifier and the second signal terminal of the first AC coupling capacitor.
1 more element
A differential amplifier circuit comprising:
- a first buffer circuit comprising a first source follower transistor having a gate coupled to a first input of the differential amplifier circuit and a source coupled to a first output of the differential amplifier circuit, and a first current source transistor having a drain coupled to a source of the first source follower transistor;
- a second buffer circuit comprising a second source follower transistor having a gate coupled to a second input of the differential amplifier circuit and a source coupled to a second output of the differential amplifier circuit, and a second current source transistor having a drain coupled to the source of the second source follower transistor;
- a first capacitor network coupled between the first output of the differential amplifier circuit and a gate of the second current source transistor;
- a first feedback capacitor coupled between the first output of the differential amplifier circuit and the first input of the differential amplifier circuit;
- a second capacitor network coupled between the second output of the differential amplifier circuit and a gate of the first current source transistor;
- and
- a second feedback capacitor coupled between the second output of the differential amplifier circuit and the second input of the differential amplifier circuit.
4 more elements
A method of amplifying an output of Micro-Electro-Mechanical Systems (MEMS) microphone, the method comprising:
- AC coupling a first output of the MEMS microphone using a first AC coupling capacitor to produce a first AC coupled signal at a first feedback node;
- amplifying the first AC coupled signal using a first amplifier to produce a first amplified signal;
- feeding back the first amplified signal to the first feedback node via a first programmable capacitor;
- and
- feeding back the first amplified signal to the first feedback node via a parasitic capacitance of the first AC coupling capacitor coupled in parallel with the first programmable capacitor.
2 more elements
An integrated circuit comprising:
- a first non-inverting amplifier disposed on a monolithic semiconductor substrate, the first non-inverting amplifier having an input coupled to a first input pad of the monolithic semiconductor substrate;
- a first programmable capacitor disposed on the monolithic semiconductor substrate, the first programmable capacitor directly connected between an output of the first non-inverting amplifier and the input of the first non-inverting amplifier;
- and
- a first AC coupling capacitor coupled between first input pad and the input of the first non-inverting amplifier, wherein a first parasitic capacitance of the first AC coupling capacitor is coupled between the output of the first non-inverting amplifier and the input of the first non-inverting amplifier.
1 more element
Dependencies are inferred from the claim text.