Impedance converter

The invention relates to the fields of measuring equipment and radio electronics and can be used for the reproduction of virtual impedances with independent regulation of the modulus and phase.The impedance converter comprises two terminals (2, 8), a first operational amplifier (1) and a second operational amplifier (4) with two inputs and one output each, a code-controlled variable resistor (3), connected with the poles between the noninverting input of the first operational amplifier (1) and the output of the second operational amplifier (4), a fixed resistor (5), connected with the poles between the noninverting input of the second operational amplifier (4) and the common wire, a differential amplifier (6) with the unit amplification coefficient, having its inputs connected, respectively, to the output and noninverting input of the second operational amplifier (4), a code-controlled phase shifter (7) with the possibility of phase regulation in the value range of 0°...360° and with the unit amplification coefficient, having its input connected to the output of the differential amplifier (6) and its output - to the noninverting input of the second operational amplifier (4). The first operational amplifier (1) has its inverting input connected to its output and to the inverting input of the second operational amplifier (4), and the terminals (2, 8) are connected, respectively, to the noninverting input of the first operational amplifier (1) and to the common wire. Inventia se refera la domeniile tehnicii de masurare si radioelectronicii si poate fi utilizata pentru reproducerea impedantelor virtuale cu reglare independenta a modulului si fazei.Convertorul de impedanta contine doua cleme (2, 8), primul amplificator operational (1) si al doilea amplificator operational (4) cu câte doua intrari si o iesire fiecare, un rezistor variabil (3) comandat de cod, conectat cu polii între intrarea neinversoare a primului amplificator operational (1) si iesirea celui de-al doilea amplificator operational (4), un rezistor fix (5), conectat cu polii între intrarea neinversoare a celui de-al doilea amplificator operational (4) si masa, un amplificator diferential (6) cu coeficientul de amplificare unitar, conectat cu intrarile, respectiv, la iesirea si la intrarea neinversoare a celui de-al doilea amplificator operational (4), un defazor (7) comandat de cod cu posibilitatea reglarii fazei în banda de valori 0°...360° si cu coeficientul de amplificare unitar, conectat cu i