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GaAsFET_BIAS_SUPPLY_1

2015-03-20 19:08  
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GaAsFET_BIAS_SUPPLY_1
The LTC1550 and LTC1551CS8-4.1 are switched-capacitor voltage inverters that generate a regulated -4.1-V output at up to 20-mA load current. An internal linear postregulator reduces the out-put-voltage ripple to less than 1 mV, making the LTC1550 and LTC1551CS8-4.1 excellent for use as bias-voltage generators for transmitter GaAsFETs in portable RE and cellular telephone applications. The single supply voltage can range from 4.5 to 6.5 V (7 V absolute maximum). The charge pump uses four small external capacitors and operates at 900 kHz, eliminating interference with the 400-to 600-kHz IF signals commonly used in RF systems.