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100-MHz: 1 A Output current driver reference design for high capacitive load applications

Texas Instruments

This reference design uses the THS3491 high-speed: high-voltage current feedback amplifier to demonstrate an output current drive capability of greater than 1 A into a low-resistive or high-capacitive load while maintaining a large signal bandwidth of 100 MHz at 20 VPP. The high output current drive is achieved by using two or more THS3491 amplifiers in load sharing configuration to optimize large-signal bandwidth and distortion performance. THS3491 enables high-capacitive load applications because of the 900-MHz BW and ±420 mA of linear output-current drive capability. The design utilizes the VQFN-16 (RGT) package due to the best large signal bandwidth: low distortion and optimal thermal performance.

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Features

Output current drive ≥ 1 AHigh capacitive load drive of 100 to 1000 pF20 Vpp output voltage swing at 100 MHz: RL = 20 Ω20 Vpp output voltage swing at 30 MHz: RS = 20 Ω and CL = 1 nFLarge signal bandwidth > 100 MHzFlexibility for output current drive (two: three or four parallel amplifiers)