A current generator circuit with controllable frequency response has at least one current mirror formed of MOS transistors, being powered through a terminal held at a constant voltage, having an input leg through which a reference current (I1) is driven by a first current generator (G1), and having an output leg for generating, on an output terminal (OUT) of the mirror, a mirrored current (I.sub.out) which is proportional to the reference current (I1). The input leg includes at least a first transistor (M1) which is diode-connected and has a control terminal (Ga1) coupled to a corresponding terminal (Ga2) of a second transistor (M2) included in the output leg. In accordance with the invention, the mirror circuit also has an impedance matching circuit connected across the control terminals (Ga1 and Ga2) of the first and second transistors and configured to hold the same voltage value at both terminals (Ga1 and Ga2). The impedance matching circuit has an adjustable output impedance, specifically lower in value than the value to be had without this circuit. It functions to regulate the impedance on the control node (Ga2) of the second transistor (M2). The invention is equally applicable to N-channel and P-channel MOS transistors. Advantageously, the reference current can be varied by an external signal which is a function of the output signal, to provide feedback regulating features.

A method of high frequency current signal amplification utilizing Metal-Oxide-Silicon Field Effect Transistors (MOSFETS) allows the use of MOSFETS for current signal amplification in the radio frequency (RF) range of the electromagnetic spectrum and minimizes the effects of parasitic capacitance. A current signal is applied to pluralities of MOSFETS arranged in amplification stages such that the amplification of the input current signal is determined by the ratio of the channel widths of the MOSFETS employed. Alternating amplification stages comprised of N-conductivity type and P-conductivity type devices are employed. The amplification of the signal can be precisely controlled by both the width of the channels within the MOSFETS and the number of current signal amplification stages employed. The output signal can also be converted to a voltage signal by coupling to a source of resistance or reactance.

A current generator circuit with controllable frequency response has at least one current mirror formed of MOS transistors, being powered through a terminal held at a constant voltage, having an input leg through which a reference current (I1) is driven by a first current generator (G1), and having an output leg for generating, on an output terminal (OUT) of the mirror, a mirrored current (I.sub.out) which is proportional to the reference current (I1). The input leg includes at least a first transistor (M1) which is diode-connected and has a control terminal (Ga1) coupled to a corresponding terminal (Ga2) of a second transistor (M2) included in the output leg by an impedance matching circuit configured to hold the same voltage value at both terminals (Ga1 and Ga2). The impedance matching circuit has an adjustable output impedance, specifically lower in value than the value to be had without this circuit. It functions to regulate the impedance on the control node (Ga2) of the second transistor (M2). The invention is equally applicable to N-channel and P-channel MOS transistors. Advantageously, the reference current can be varied by an external signal which is a function of the output signal, to provide feedback regulating features.

The present invention relates to a current amplifier including a first MOS transistor with a drain defining a first terminal for controlling the amplifier with a current and a source connected to a first supply line. It also includes a second MOS transistor with a drain forming a terminal of current output of the amplifier and a source connected to the first supply line, and at least one first bipolar transistor having a base connected to the first control terminal, an emitter connected to a gate of the first MOS transistor and is, via a first biasing resistor, connected to the first supply line and having a collector of the first bipolar transistor being connected to a second supply line.

A current mirror circuit is disclosed including a reference device and a biased device, each having control, input and output elements, with the control element of the biased device operably connected to the control element of the reference device. A reference current source is connected to the input element of the reference device and produces a reference current flowing through the reference device, wherein a bias current is produced in the biased device as a multiple of the reference current. A compensation network is connected between the biased device and the reference device for maintaining a constant bias current in the biased device regardless of varying operating characteristics in at least one of the biased device and the reference device.