| 摘要 |
FIELD: radio engineering, communication.SUBSTANCE: low-noise crystal oscillator with automatic gain control consists of a generator unit, an amplifier unit and an automatic gain control (AGC) unit, wherein the generator unit includes a crystal resonator, a bipolar transistor, five capacitors, two inductance coils, four resistors; the amplifier unit includes a MOS transistor, a resistor and three capacitors; the output of the generator unit is connected through a capacitor to the first gate of the MOS transistor; the output of the amplifier unit is connected to the input of the AGC unit, the output of which is connected to the second gate of the MOS transistor; the AGC unit includes an operational amplifier and a power detector.EFFECT: providing low level of phase noise of an output signal at constant level of output power.14 cl, 3 dwg |
