Negative feedback is provided through a feedback resistor.

A first output is operably coupled to a first feedback path (425) comprising a V2V feedback resistor (435); and a second output is operably coupled to second feedback path (430) comprising an I2V feedback resistor (440).

A circuit for establishing the input impedance of an amplifier includes an amplifier (12), a circuit component (14), a first feedback resistor (18), and a second feedback resistor (20).

An analog filter is presented that comprises a chain of filter stages, a feedback resistor for providing a negative feedback, and a feedback capacitor for providing a positive feedback.

The second end of the feedback resistor is connected with the feedback input pin of the constant current controller.

The emitter of the triode is connected with the first end of the feedback resistor.

The second feedback resistor (20) is coupled to the amplifier (12) and has a second impedance (ZF2).

The feedback resistor (RA) comprises a thermistor (3) and a fixed resistor (R2) that is coupled to the thermistor (3) in series.

The preferred receiver eliminates both the shunting resistor and the feedback resistor on the input end by amplifying the signal in current form.

The voltage generator comprises an operation amplifier (1), an input resistor (2), an output resistor (3), a feedback resister (4), a clamper (10) and a clamper (6).

The second end of the feedback is connected with the negative electrode of the external constant current power.

The switch passes only low-voltage pulses to the low-noise amplifier circuit which requires an input resistance and a feedback resistance.

The controller turns on through the feedback resistor and the parasitic diode of the controller, thus eliminating the need for a startup resistor.

The first feedback resistor (18) is coupled to the amplifier (12) and the load (72), and has a first impedance (ZF1).

By increasing the value of the feedback resistance, the effective noise of the receiver is lower.