| 摘要 |
<p>An amplifier circuit comprises a circuit input (14), and a circuit output (22). An inverter, comprising first and second MOS transistors (16, 18) is connected between first and second supply voltages (Vdd, Vss), and has an inverter input connected to the circuit input (14), and an inverter output (20), which provides an inverter output current corresponding to a circuit input voltage. A first resistive element comprises a third MOS transistor (24) and a fourth MOS transistor (26), the third and fourth transistors being of opposite conductivity types, and each having their gate and drain terminals connected to the inverter output (20) and the circuit output (22), and having their respective source terminals connected to respective ones of the first and second supply voltages (Vdd, Vss). A second resistive element comprises a fifth MOS transistor (30) and a sixth MOS transistor (32), the fifth and sixth transistors being of opposite conductivity types, and each having its drain-source path connected between the circuit output (22) and the circuit input (14), and having its gate connected to a respective voltage source (34, 36). The amplifier circuit is suitable for integration using CMOS techniques, and for use at radio frequencies, while providing good performance in terms of its noise figure. Alternative embodiments are disclosed having various combinations of the above components.</p> |
