Patent ID: 7622995

Claim:
A negative-feedback type ultra-wideband signal amplification circuit having an input/output interface including a signal input port and a signal output port, for amplifying an input signal at the signal input port; the negative-feedback type ultra-wideband signal amplification circuit comprising a first-stage amplification module and a second-stage amplification module. wherein: the first-stage amplification module includes: a dual-step filtering circuit unit, which is connected between the signal input port and a first node for providing a dual-step filtering function for the input signal; an input-side transistor circuit unit, which includes a first transistor and a second transistor, each having a control terminal, a first connecting terminal, and a second connecting terminal; wherein the first transistor has its control terminal connected to the first node, its first connecting terminal connected to a grounding point, and its second connecting terminal connected to the first connecting terminal of the second transistor; and wherein the second transistor has its control terminal connected to a fixed voltage source, its first connecting terminal connected to the second connecting terminal of the first transistor, and its second connecting terminal connected to the a second node; a first-stage feedback circuit unit, which is connected between the second node and the first node, for providing a feedback path from the second node via the first node to the control terminal of the first transistor; and a first-stage load circuit unit, which is connected between the second node and a first drive voltage, for providing an enhanced amplification effect to a first-stage output signal at the second node; and wherein: the second-stage amplification module includes: an output-side transistor circuit unit, which includes a third transistor having a control terminal electrically coupled to the second node in the first-stage amplification module, a first connecting terminal connected to the signal output port, and a second connecting terminal connected to the grounding point; a second-stage feedback circuit unit, which is connected between the signal output port and the control terminal of the third transistor, for providing a feedback path from the signal output port to the control terminal of the third transistor; and a second-stage load circuit unit, which is connected between the signal output port and a second drive voltage, for providing an enhanced amplification effect to a second-stage output signal at the signal output port.