Linear – New 4GHz amplifier achieves <1pA input bias current from -40C to 85C

Linear Technology has introduced the LTC6268-10, a new series of single and dual LTC6269-10 4GHz FET-input op amps for high dynamic range and high speed transimpedance amplifier (TIA) applications. The decompensated amplifiers extend the speed and dynamic range capabilities of this ultralow bias current op amp family for applications with a gain of 10 or higher. Input bias current is 0.9pA max over the -40C to 85C temperature range and just 4pA max over the entire -40C to 125C temperature range. Wideband voltage and current noise is 4nV/vHz and 7fA/vHz, respectively. With 0.45pF input capacitance and 1000V/µs slew rate, the LTC6268-10 and LTC6269-10 are well suited for photodiode and photomultiplier (PMT) circuits, high impedance sensor applications and for driving analog-to-digital converters (ADCs). The LTC6268-10 data sheet features circuit and layout techniques to maximize TIA performance, with example circuits ranging from 20kohm transimpedance gain at 210MHz bandwidth, to 402kohm transimpedance gain at 34MHz bandwidth. The LTC6268-10 is available in a 6-lead SOT-23 package, as well as an 8-lead SOIC with guard pins to protect against board leakage currents. The LTC6269-10 is available in an MSOP-8 with exposed pad and in 3mm x 3mm DFN-10 packages. The LTC6268-10 and LTC6269-10 are fully specified over the industrial -40C to 85C and -40C to 125C temperature ranges, says the company.