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US 2024/0275348 A1Published application
Two-Stage Circuit With Power Supply Rejection Filter
AssigneeQUALCOMM Incorporated
InventorsMarco VIGILANTE, Yunliang ZHU
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Abstract
A two-stage circuit includes a differential-to-single-ended first stage with a differential pair of transistors. The first stage includes a current mirror including a diode-connected transistor having an RC circuit coupled to a drain of the diode-connected transistor. The current mirror is configured to mirror a power supply noise current conducted by the RC circuit through a first stage output terminal to a gate of an output transistor in a second stage of the two-stage circuit.
Claims26
A two-stage circuit comprising:
- a first stage including:
- a differential pair of transistors;
- a current mirror coupled to a terminal of a first transistor in the differential pair of transistors, the current mirror including a diode-connected transistor;
- a resistor-capacitor (RC) circuit that is coupled between a drain of the diode-connected transistor and ground;
- and
- a second stage including an output transistor having a gate coupled to an output terminal of the first stage.
3 more elements
A power supply rejection method for a two-stage circuit, comprising:
- conducting a first noise current from a power supply rail to an RC compensation circuit at a gate of an output transistor in a second stage of the two-stage circuit responsive to a noise disturbance of a power supply voltage on the power supply rail;
- conducting a second noise current from a drain of a diode-connected transistor in a current mirror to ground through an RC circuit in a first stage of the two-stage circuit responsive to the noise disturbance;
- and
- mirroring the second noise current through the current mirror to the gate of the output transistor to combine the second noise current with the first noise current to conduct a combined noise current through the RC compensation circuit that is less than the first noise current.
1 more element
A two-stage circuit, comprising:
- a first stage including:
- a first stage output terminal;
- a low-impedance node, wherein an impedance of the low-impedance node is lower than an impedance of the first stage output terminal;
- a differential pair of transistors coupled to the first stage output terminal and the low-impedance node;
- an RC circuit having a resistor in series with a capacitor, wherein the RC circuit is coupled between ground and the low-impedance node;
- and
- a second stage including an output transistor having a gate coupled to the first stage output terminal.
4 more elements
Dependencies are inferred from the claim text.