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Electronic Schematics - F

Frequency Synthesizer Circuits

Low-cost, programmable oscillator operates at 2 GHz: 5/11/00  EDN-Design Ideas  / All wireless communication systems need a local oscillator. Figure 1 shows a low-cost PLL circuit for the 2-GHz band for such applications as industrial, scientific, and medical (ISM) and satellite personal-communication systems (S-PCS).

PLL frequency synthesizer oscillator circuit with MB87014A - Synthesizer oscillation circuit to introduce here is using the PLL frequency synthesizer (MB87014A). It is possible to make oscillate the stable high frequency signal. The PLL is the abbreviation of Phase Locked Loop. In the operation of the PLL, it compares the frequency of the reference frequency oscillator and the frequency of the voltage controlled oscillator by the phase. When there is a difference of the phase, it works as if to control the VCO and to lose the difference. It controls repeatedly loop) like the oscillation frequency phase comparison voltage control oscillation frequency.

Frequency Synthesizer - A frequency-selective frequency multiplier can be construct with a PLL system by inserting frequency divider inside the feedback between the phase detector input and the VCO output. Figure below shows the schematic diagram of low-frequency synthesizer with a programmable three decades divider circuit.

PLL frequency synthesizer oscillation circuit with IC MC145163 - This IC number MC145163 is IC for the PLL frequency synthesizer which can specify the dividing ratio of the comparison frequency by BCD (Binary Coded Decimal).

PLL Frequency Synthesizer - The ADF4107 Frequency Synthesizer CAN be used to implement local Oscillators in the up conversion and down conversion sections of Wireless receivers and transmitters. It consists of a low noise digital PFD (phase frequency detector), a precision Charge Pump programmable reference divider, programmable A and B Counters and a dual-modulus prescaler (P/P + 1). The A (6-bit) and B (13-bit) Counters in conjunction with the dual-modulus prescaler (P/P + 1), implement an N divider (N = BP + A). In addition, the 14-bit reference Counter (R counter), allows selectable REFIN frequencies at the PFD input.

Frequency Synthesizer Circuit Composed of MSM5820RS - The circuit shows the frequency Synthesizer circuit which is composed of MSM5820RS. The circuit uses 400HZ as center and it realizes ±10% frequency regulation by adjusting FP1's resistance value. S1 is reset switch. The oscillating circuit of 2MHz which is composed of TC5082P and crystal will output frequency signal of 500KHZ through pin 5 after it is frequency divided by TC40H074P. The signal will be put on MSM5820RS's pin 27 and then it will output signal from pin 6.


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