| 摘要 |
PURPOSE:To reduce cost by enabling the titled circuit to detect an AFC error voltage by using a sample hold circuit, and making a conventionally used synchronizing detector unnecessary. CONSTITUTION:Receiving a switching signal 2; a pulse regeneration circuit 11 outputs sampling pulses 15 and 16, which are supplied to sample hold circuits 12 and 13, respectively. Then these sample hold circuits 12 and 13 sample voltages DELTAVx and Vr and whose outputs are supplied to inversion and none-inversion input terminals of a comparator 14. Accordingly, the output terminal of this comparator 14 obtains an error voltage, DELTAV=DELTAVx-Vr, which is supplied to a voltage controlled generator 3 as an AFC voltage through a low pulse filter 10. |
