High impedance bias network
AssigneeFairchild Semiconductor Corporation
InventorsChristopher Bennett, Hrvoje Jasa
Life of this patent
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Abstract
This document discusses, among other things, a system and method for offsetting reverse-bias leakage of a high impedance bias network. In an example, an apparatus includes an anti-parallel diode pair coupled between a signal node and a common-mode node. The anti-parallel diode pair can include a first diode and a second diode coupled to the first diode. A third diode can be coupled between a supply node and the signal node, and the third diode can be sized to compensate for a parasitic diode junction of the anti-parallel diode pair.
Claims20
An apparatus comprising:
- an anti-parallel diode pair coupled between a signal node and a common-mode node, the anti-parallel diode pair including:
- a first diode;
- and
- a second diode coupled to the first diode;
- and
- a third diode coupled between a supply node and the signal node, the third diode sized to compensate for a parasitic diode junction of the anti-parallel diode pair.
A method comprising:
- receiving a signal at a signal node of an anti-parallel diode pair;
- receiving an offset voltage at a common-mode node of the anti-parallel diode pair;
- and
- providing a compensation current through a third diode coupled to the signal node, the compensation current configured to offset a leakage current of a parasitic diode junction of the anti parallel diode pair.
A system comprising:
- a microphone configured to generate a signal corresponding to received ambient sound;
- and
- an integrated circuit configured to receive the signal at a signal node, to receive a common-mode voltage at a common-mode node, and to offset the signal by the common-mode voltage, the integrated circuit including:
- an anti-parallel diode pair coupled between the signal node and the common-mode node, the anti-parallel diode pair including
- a first diode;
- and
- a second diode coupled to the first diode;
- and
- a third diode coupled between a supply node and the signal node, the third diode sized to compensate for a parasitic diode junction of the anti-parallel diode pair.
Dependencies are inferred from the claim text.