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US 5,859,563 AGranted
Low-noise low-impedance voltage reference
AssigneeTexas Instruments Incorporated
InventorsHenry Tin-Hang Yung, Steve Wiyi Yang, Michael J. Tsecouras
Life of this patent
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Abstract
A voltage reference circuit includes: an amplifier A1 with low open loop output impedance, an output of the amplifier is coupled to a first input of the amplifier A1; and a first resistor R1 coupled between the output of the amplifier A1 and a reference node 30, the first resistor R1 has a resistance substantially equally to the low open loop output impedance, whereby a low frequency impedance at the reference node 30 is substantially equal to the resistance.
Claims2
A voltage reference circuit comprising:
- an amplifier with low open loop output impedance, an output of the amplifier is coupled to a first input of the amplifier;
- a first resistor coupled between the output of the amplifier and a reference node, the first resistor has a resistance substantially equally to the low open loop output impedance, whereby a low frequency impedance at the reference node is substantially equal to the resistance;
- a second resistor coupled to a second input of the amplifier;
- a second capacitor coupled between the second input of the amplifier and ground;
- and
- a switch coupled between a first end of the second resistor and a second end of the second resistor.
3 more elements
Dependencies are inferred from the claim text.