An isolation circuit and a method for providing isolation between two dies are provided. The isolation circuit includes: an isolation module, configured to generate an isolation signal based on an input signal from a first die and to provide isolation between the first die and a second die, where the isolation signal is smaller than the input signal in amplitude, and the first die is coupled with the second die; a latch module, configured to latch the isolation signal at a certain level and output a latched signal; an amplifier module, configured to amplify the latched signal. In the isolation circuit, a modulation module and a demodulation module can be saved.

A method for a fast settling ripple reduction loop for high speed precision chopper amplifiers includes amplifying an input signal with a signal path to generate a first output, the signal path comprising chopping the input signal to generate a first chopper output, amplifying the first chopper output with an amplifier to generate an amplifier output and chopping the amplified output to generate a second chopper output. An output ripple of the first output is reduced with a Ripple Reduction Loop comprising chopping the second chopper output to generate a third chopper output, filtering the third chopper output with a filter to generate a Direct Current (DC) offset correction, and combining the DC offset correction with the amplifier output, wherein the third chopper output is driven to the output voltage of the filter and the RRL is disconnected from the low frequency signal path in response to a non-linear event.

A Class D amplifier comprising a control circuit configured to receive an audio input signal and derive first, second and third PWM switching control signals therefrom, being supplied to respectively first, second and third switches of a driver, the first and second switches being serially arranged between first and second supply voltages, and having a common node coupled to an output terminal. The driver comprises a DC level shifter being configured to provide a reference voltage to a reference terminal in at least first and second states of operation, said reference voltage including a DC component at least substantially equidistant between the first and second supply voltages. Said third switch being included in a shunt path between the output and the reference terminal.

Isolated circuit systems are provided. The systems include a primary side circuit and a secondary circuit, electrically isolated from each other. The primary side and secondary side circuits each utilize a direct current (DC) reference signal. The primary side circuit may use the DC reference signal in a modulation operation. The secondary side circuit may use the DC reference signal in a demodulation operation. The DC reference signal may be sent from the primary side circuit to the secondary side circuit, or from the secondary side circuit to the primary side circuit.

A capacitive-coupled chopper instrumentation amplifier includes a first chopper, a first gain stage, a capacitive isolation stage electrically coupled between inputs of the first gain stage and the first chopper, a second gain stage, a second chopper electrically coupled between outputs of the first gain stage and inputs of the second gain stage, clamping circuitry electrically coupled between the inputs of the first gain stage and a reference voltage rail, and a controller. The controller is configured to (a) detect a change in a first common-mode voltage exceeding a threshold value, the first common-mode voltage being a common-mode voltage at the inputs of the amplifier, and (b) in response to detecting the change in the first common-mode voltage exceeding the threshold value, cause the clamping circuitry to clamp the inputs of the first gain stage to the reference voltage rail.

An amplification device configured for amplifying a signal with a DC signal component is provided, which comprises a coupling filter circuit having an input terminal and an output terminal. The coupling filter circuit attenuates the DC signal component of an input signal to obtain a filtered output signal. The coupling filter circuit comprises a first capacitor circuit connecting the input terminal to the output terminal; a second capacitor circuit connected in parallel to the first capacitor circuit, a first resistor and a second resistor, wherein the second capacitor, the first resistor and the second resistor are serially connected; and a resistor circuit connected to the input terminal and the output terminal and comprising a third resistor connected to the input terminal and a fourth resistor connected to the output terminal. The amplification device comprises an amplification circuit connected to the output terminal, which amplifies the filtered signal.

A method for matching a pair of composite circuit elements (CEs) included in a circuit includes fabricating N CEs (e.g., resistors, transistors, current sources, capacitors) designed to match and switches configurable, according to M different combinations, to connect N/2 of the N CEs to form a first composite CE and to connect a remaining N/2 of the N CEs to form a second composite CE. Sequentially in time, for each combination of the M combinations, the switches are configured to form the first and second composite CEs according to the combination and a characteristic of the circuit is measured that includes the formed first and second composite CEs. The characteristic indicates how well the formed composite CEs match. A final combination of the M combinations is chosen whose measured characteristic indicates a best match and the final combination is used to configure the switches to form the composite CEs.

The present disclosure relates to chopper amplifier circuits featuring inherent chopper ripple suppression.

Chopper amplifiers with multiple sensing points for correcting input offset are disclosed herein. In certain embodiments, a chopper amplifier includes chopper amplifier circuitry including an input chopping circuit, an amplification circuit, and an output chopping circuit electrically connected in a cascade along a signal path. The chopper amplifier further incudes a multi-point sensed offset correction circuit that generates an input offset compensation signal based on sensing a signal level of the signal path at multiple signal points. Furthermore, the multi-point sensed offset correction circuit injects the input offset compensation signal into the signal path to thereby compensate for input offset voltage of the amplification circuit while suppressing output chopping ripple from arising.

Chopper amplifiers with multiple sensing points for correcting input offset are disclosed herein. In certain embodiments, a chopper amplifier includes chopper amplifier circuitry including an input chopping circuit, an amplification circuit, and an output chopping circuit electrically connected in a cascade along a signal path. The chopper amplifier further incudes a multi-point sensed offset correction circuit that generates an input offset compensation signal based on sensing a signal level of the signal path at multiple signal points. Furthermore, the multi-point sensed offset correction circuit injects the input offset compensation signal into the signal path to thereby compensate for input offset voltage of the amplification circuit while suppressing output chopping ripple from arising.