OPA660

® OPA 660 OPA660 OPA 660 Wide Bandwidth OPERATIONAL TRANSCONDUCTANCE AMPLIFIER AND BUFFER FEATURES q WIDE BANDWIDTH: 850MHz q HIGH SLEW RATE: 3000V/µs q LOW DIFFERENTIAL GAIN/PHASE ERROR: 0.06%/0.02° q VERSATILE CIRCUIT FUNCTION q EXTERNAL IQ-CONTROL APPLICATIONS q BASE LINE RESTORE CIRCUITS q VIDEO/BROADCAST EQUIPMENT q COMMUNICATIONS EQUIPMENT q HIGH-SPEED DATA ACQUISITION q WIDEBAND LED DRIVER q AGC-MULTIPLIER q NS-PULSE INTEGRATOR q CONTROL LOOP AMPLIFIER q 400MHz DIFFERENTIAL INPUT AMPLIFIER 200Ω 8 C 3 B OTA E 2 RP 82Ω CP 6.4pF R5 100Ω R3 390Ω 5 +1 6 VO DESCRIPTION The OPA660 is a versatile monolithic component designed for wide-bandwidth systems including high performance video, RF and IF circuitry. It includes a wideband, bipolar integrated voltage-controlled current source and voltage buffer amplifier. The voltage-controlled current source or Operational Transconductance Amplifier (OTA) can be viewed as an “ideal transistor.” Like a transistor, it has three terminals—a high-impedance input (base), a lowimpedance input/output (emitter), and the current output (collector). The OTA, however, is self-biased and bipolar. The output current is zero-for-zero differential input voltage. AC inputs centered about zero produce an output current which is bipolar and centered about zero. The transconductance of the OTA can be adjusted with an external resistor, allowing bandwidth, quiescent current and gain trade-offs to be optimized. The open-loop buffer amplifier provide...