High frequency oscillation circuit
专利汇可以提供High frequency oscillation circuit专利检索，专利查询，专利分析的服务。并且PURPOSE: To provide a sure oscillation start characteristic and to attain the oscillation with high reliability by providing two diodes connected in anti-parallel between a feedback circuit inserted in series with a surface acoustic wave resonator and ground.
CONSTITUTION: Coupling capacitors 17, 18 are inserted in series across the surface acoustic wave resonator 3 and two diodes 19, 20 connected in anti- parallel are provided between a beedback circuit of an amplifier circuit comprising a FET 2 and ground. Then no current flows to the diodes 19, 20 at oscillation start to attain a sufficiently high impedance and the bias applied to the FET 2 is adjusted to minimize the insertion loss of the feedback circuit and to maximize the mutual conductance. Thus, the loop gain is much increased, sure oscillation start is applied and when exciting power is increased after the oscillation start, a current flowing to the diodes 19, 20 is increased to increase the loss. Thus, the loop gain is controlled to the unity by the negative feedback to make the oscillation output of a high frequency oscillation circuit 1 constant thereby improving the reliability.
COPYRIGHT: (C)1987,JPO&Japio，下面是High frequency oscillation circuit专利的具体信息内容。
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