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SHC615General DescriptionThe SHC615 is a complete subsystem for very fast and precise DC restoration, offset clamping, and low frequency hum suppression of wideband amplifiers or buffers. Designed to stabilize the performance of video signals, it can also be used as a sample/hold amplifier, high-speed integrator, or peak detector for nanosecond pulses. A wideband Operational Transconductance Amplifier (OTA) with a high-impedance cascode current source output and fast sampling comparator set a new standard for high-speed applications. Both can be used as stand-alone circuits or combined to form a more complex signal processing stage. The self-biased, bipolar OTA can be viewed as an ideal voltage-controlled current source and is optimized for low input bias current. The sampling comparator has two identical high-impedance inputs and a current source output optimized for low output bias current and offset voltage; it can be controlled by a TTL-compatible switching stage within a few nanoseconds. The transconductance of the OTA and sampling comparator can be adjusted by an external resistor, allowing bandwidth, quiescent current, and gain tradeoffs to be optimized. The SHC615 is available in SO-14 surface mount and 14-pin plastic DIPs, and is specified over the extended temperature range of -40°C to +85°C.
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