发明名称 |
Programmable instrumentation amplifier |
摘要 |
A first amplifier channel between an input and output includes an input transistor emitter and a first output transistor emitter connected together to form a first emitter pair. A current source is connected to the emitter pair via a transistor which is controlled by a latch. Programming the latch permits the channel to be turned on or off. The emitter pair is connected to a positive voltage through a resistor and to ground through a diode to force it to a controlled off voltage, which prevents signals from passing when the channel is off. There is a output driver amplifier in a feedback circuit. An outdisable circuit controls the voltage and current of the output driver amplifier to place the output in a state in which it appears electrically as an open circuit when the channel is off. Multiple programmable amplifiers can be combined to make a multiplexer, a selectable gain circuit, or a selectable attenuation circuit, all with high band width and high signal integrity.
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申请公布号 |
US5600278(A) |
申请公布日期 |
1997.02.04 |
申请号 |
US19950384295 |
申请日期 |
1995.02.03 |
申请人 |
HEWLETT-PACKARD COMPANY |
发明人 |
UHLING, THOMAS F.;GRIGGS, KEITH C. |
分类号 |
G01R13/22;G01R1/30;H03F1/42;H03F3/189;H03F3/72;H03G1/00;H03G3/00;H03G3/02;H03G3/10;H03G3/30;H03K17/0812;H03K17/62;(IPC1-7):H03F3/68 |
主分类号 |
G01R13/22 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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