仪表放大器不用反馈电阻器就能提供精确的增益,并且,在任何增益值下,它的非反相和反相输入端都有高输入阻抗。在一个典型的IC仪表放大器中,连接两个增益调整脚的单只电阻器就能确定电路的总增益。大多数仪表放大器的集成版都可以在单位增益下保持管脚为开放状态,但要获得超过1的增益时,则需要增益限定设定电阻器。 Instrumentation amplifiers provide accurate gain without feedback resistors and have high input impedance at any gain value at their non-inverting and inverting inputs. In a typical IC instrumentation amplifier, a single resistor that connects two gain tuning pins determines the overall gain of the circuit. Most in-amps have an integrated version that holds their pins open at unity gain, but gain-setting resistors are required to gain gains in excess of unity.