Abstract: An IC includes an externally accessible terminal, a filter, and an output stage. The filter has an adjustable bandwidth and has an output node coupled to the externally accessible terminal, and the output stage has an input node coupled to the output node of the filter. By providing access to a node that is between the filter and an amplitude-limiting output stage, the IC allows one to adjust the bandwidth of the filter—or the bandwidth of a circuit, such as an amplifier, that includes the filter—by measuring the amplitude of a signal that can have a relatively high S/N ratio without being clipped by the output stage. Consequently, such access can eliminate the need for a high-precision bandwidth-adjust setup and its long bandwidth-adjust times.

Abstract: An IC includes an externally accessible terminal, a filter, and an output stage. The filter has an adjustable bandwidth and has an output node coupled to the externally accessible terminal, and the output stage has an input node coupled to the output node of the filter. By providing access to a node that is between the filter and an amplitude-limiting output stage, the IC allows one to adjust the bandwidth of the filter—or the bandwidth of a circuit, such as an amplifier, that includes the filter—by measuring the amplitude of a signal that can have a relatively high S/N ratio without being clipped by the output stage. Consequently, such access can eliminate the need for a high-precision bandwidth-adjust setup and its long bandwidth-adjust times.

Abstract: An amplifier includes an amplification path and multiple offset-compensation feedback paths. The amplification path has multiple amplifier stages, and the feedback paths are coupled to the amplification path. By including multiple feedback paths, such an amplifier can maintain its output DC-offset voltage at a desired level over a full range of amplitudes, i.e., power, of the input signal.