| 摘要 |
<p>An oscillator, constructed partially within the confines of a monolithic integrated circuit, includes a differential-input, differential-output, differential amplifier within the monolithic integrated circuit. First and second resistive potential dividers located within the monolithic integrated circuit respectively divide the potentials appearing at the first and second output terminals of the differential amplifier in a predetermined ratio for respective application to the first and second input terminals of the differential amplifier, thereby respectively completing first and second direct-coupled regenerative feedback connections. An inductor located outside the monolithic integrated circuit is connected between the first and second input terminals of the differential amplifier and is anti-resonated by one or more capacitors, which may be located inside or outside the monolithic integrated circuit. In controlled versions of the oscillator, a further differential-input, differential-output, differential amplifier is included within the monolithic integrated circuit and connected to provide Miller amplification of capacitors used in anti-resonating the inductor. The gain of this further differential amplifier is electrically controlled for controlling the frequency of the oscillations generated by the oscillator. In addition to providing Miller feedback, which is degenerative in nature and tends in varying degree to reduce the amplitude of oscillations, this further differential amplifier is arranged for providing regenerative feedback to counteract this tendency to reduce the amplitude of oscillations.</p> |
