| 摘要 |
This disclosure describes a continuous tuning arrangement for a variable frequency response circuit of the type covering a relatively wide frequency range. Many techniques for accommodating a wide frequency range are known and include synthesizers, waveform generators and so on which employ various coarse tuning controls or devices for band selection. A synthesizer is described which employs a continuous tuning means enabling one to continuously tune the circuit from a first frequency to a second frequency or from said second frequency to said first in a rapid manner, whereby continuous tuning is afforded without the necessity of returning the tuning control to a start position each time a new frequency is selected by the coarse tuning control. The continuous tuning means provided according to this disclosure incorporates a variable reactance device in which the magnitude of the control voltage is alternated according to a change from the first frequency to the second frequency as accommodated by said coarse control. In another embodiment, continuous tuning is provided again from a low to a higher frequency by means of a differential capacitor.
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