US 12,445,100 B2 · Chopper-stabilized amplifier

Abstract

A high-voltage chopper-stabilized amplifier can include two paths to compensate for non-ideal electrical parameters. A first path, leading to a primary input of the amplifier, may include a first mux interface circuit to limit voltages at the primary input of the amplifier. A second path, leading to an auxiliary input of the amplifier, may include a chopper amplifier circuit. Despite the first mux interface circuit, a slew condition on the first path may excite a current in the second path that can negatively affect the signal source. Accordingly, the disclosed amplifier further includes a second mux interface circuit that can decouple the second path while a slew condition. The second mux interface circuit is driven by a window floating comparator, which is supplied according to the voltages on primary input. A settling enhancer circuit keeps, during slew condition, certain nodes on the second path at a reference voltage.

Claims20

Dependent claims

A chopper-stabilized amplifier comprising:

a main amplifier including a primary input configured to receive an inner input signal from a first path and an auxiliary input configured to receive a compensation signal from a second path;
a first mux-interface circuit in the first path configured to limit the inner input signal received at the primary input of the main amplifier;
a chopper amplifier circuit in the second path configured to receive the inner input signal from the first path and to output the compensation signal to the auxiliary input;
a second mux-interface circuit in the second path configured to couple and decouple the chopper amplifier circuit to and from the first path;
and
a slew-detector circuit coupled to the first path and configured to:
detect that the inner input signal is in a slew condition;
and
transmit, in response to the detection, a slew signal to configure the second mux-interface circuit to decouple the second path from the first path while the inner input signal is in the slew condition.

6 more elements

A multiplexed measurement system comprising:

a multiplexer configured to couple a plurality of measurements to an output;
and
a chopper-stabilized amplifier configured to receive an input signal from the output of the multiplexer, the chopper-stabilized amplifier including:
a first mux-friendly interface circuit configured to receive the input signal and to output an inner input signal to a first path, the first mux-friendly interface circuit further configured to limit an input voltage of the input signal without increasing an input current of the input signal;
a main amplifier including a primary input configured to receive the inner input signal from the first path and an auxiliary input configured to receive a compensation signal from a second path;
a chopper amplifier circuit in the second path configured to receive the inner input signal from the first path and to output the compensation signal to the auxiliary input;
a second mux-friendly interface circuit in the second path configured to couple and decouple the chopper amplifier circuit to and from the first path;
and
a slew-detector circuit coupled to the first path and configured to detect that the inner input signal is in a slew condition and transmit, in response to the detection, a slew signal to configure the second mux-friendly interface circuit to decouple the second path from the first path while the input signal is in the slew condition.

6 more elements

Dependencies are inferred from the claim text.

Chopper-stabilized amplifier

Life of this patent

Chopper-stabilized amplifier

Life of this patent

Abstract

Claims20