Repeaters are described that operate to rapidly transition from low-power standby states to a low frequency signal transmission state. Bandwidth for high-frequency signal transmission is preserved.

A monolithically-integrated current-feedback instrumentation amplifier includes two differential pairs of transistors. A drain terminal of transistor is directly connected to a drain terminal of transistor and to a differential voltage amplifier, and is connected to a ground terminal by means of a first sink resistor. A drain terminal of transistor is directly connected to a drain terminal of transistor and to the differential voltage amplifier, and is connected to a ground terminal by means of a second sink resistor. An output terminal of the differential voltage amplifier is connected to a resistive voltage divider. Source terminals of the transistors are directly connected together and to a first bias current source without a degeneration resistor, and source terminals of the transistors are directly connected together and to a second bias current source without a degeneration resistor. A sensing system comprising a piezoresistive N&MEMS sensor and a monolithically-integrated differential readout circuit comprising the amplifier are also provided.

An amplifier system with high gain, compact size, and extended bandwidth is disclosed. The amplifier system includes one or more inputs configured to receive one or more input signals and a pre-driver configured to receive the one or more input signals. The pre-driver may comprise source connected FETs which create a virtual ground and may include inductors which cancel or counter parasitic capacitance of the FETs. The pre-driver amplifies the one or more input signals to create one or more pre-amplified signals, which are provided to a voltage divider network configured to reduce a DC bias voltage of the one or more pre-amplified signals, while maintaining a wide bandwidth range. An amplifier receives and amplifies the output of the voltage divider network to create amplified signals. The amplifier may comprise mirrored FET pairs in a common source configuration and a common gate arrangement.

According to an embodiment, a circuit includes a core and low-frequency recovery circuits. The core circuit is configured to bias a resistive sensor used to measure a fly height of a hard disk drive. The core circuit is additionally configured to amplify a high-frequency component of a sensing signal of the resistive sensor, the sensing signal indicating the fly height. The low-frequency recovery circuit is configured to amplify the sensing signal's low-frequency component.

An integrated circuit device includes a digital-to-analog converter with multiple bit slices, each bit slice having a differential pair of driver transistors. A driver circuit includes the differential pairs of driver transistors, multiple series cascode transistors, and current bleed paths to modify drain-to-source currents in the various cascode transistors. Additional embodiments include series peaking circuits, back termination networks, and neutralization capacitors. Other embodiments are disclosed.