OPA660 Broadband Transconductive Operational Amplification and Buffer

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OPA660 is a general purpose integrated circuit designed for broadband systems, including high performance video, RF, IF circuits. OPA660 contains a broadband bipolar voltage-controlled current source and a voltage buffer amplifier. Voltage-controlled current source or transconductance operational amplifier (OTA) can be considered an "ideal triode". Like a triode, OPA660 has three poles: a high resistance input (base), a low resistance input/output (emitter), and a current output (collector). The OTA is biased and bipolar, and the corresponding output current is zero when the differential input voltage is zero. AC input centers on zero, generating output bipolar and zero-centered current. The OTA transconductance can be adjusted by an external resistance, allowing a compromise between bandwidth, static current, and gain to determine the design. Open-loop buffer amplifier provides 850MHz bandwidth and 3000V/ μ Conversion rate of S. Like for basic component modules, OPA660 has simple AGC amplification, drive LED as control amplifier for optical emission, fast pulse integrator, fast control loop amplifier, capacitive sensor and effective filter. OPA660 uses 8-foot plastic-encapsulated DIP and SO-8 surface encapsulation and can be used in basic line recovery circuit, video/broadcasting equipment, communication equipment, high-speed data collection, broadband LED driver, AGC multiplier, nanosecond pulse integrator, control loop amplifier, 400MHz differential input amplifier, etc. The pin arrangement of OPA660 and its equivalent circuit are shown in the figure. Io=20mA and G=1+R3/2Rs=3 in the figure.