Precise frequency tracking circuit

• Main Authors: LI REN, HUANG GENGFENG, HAN YONGQING, WANG YONGQIANG, YANG YONG, ZHAO LEI, ZHANG YAOJUN
• Format: Patent
• Language: Chinese; English
• Published: 01.09.2010
• Subjects: BASIC ELECTRONIC CIRCUITRY; ELECTRICITY; IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS

The utility model relates to a precise frequency tracking circuit, which comprises a voltage stabilizing circuit, a voltage dividing and filtering limiter circuit, a differentiate proportion arithmetic circuit with high input resistance, a comparison circuit, an optical coupling isolation circuit which are connected; the voltage stabilizing circuit comprises capacitors (C3 and C4), a resistor R21 and a voltage stabilizing pipe Z1; the voltage dividing and filtering limiter circuit comprises resistors (R1, R2, R7, R8, R9 and R10), capacitors (C1 and C2), electrolytic capacitor E1 and diodes (D1 and D2); the voltage dividing circuit comprises the resistors (R1, R2, R7, R8, R9 and R10), the filtering limiter circuit comprises the capacitor C1 and the diodes (D1 and D2); the other filtering circuit comprises the capacitor C2 and the electrolytic capacitor E1; the differentiate proportion arithmetic circuit with high input resistance comprises resistors (R3, R4, R5, R6, R11, R12, R13, R14, R15 and R16) and operati