Free Simple Circuit Diagram
This is a circuit of Wideband RF amplifiers. This circuit use current-feedback components like the THS3202. The THS3202 was chosen because it has fast slew rate and wide bandwidth. The amplifier voltage gain of this circuit is 20 and stage voltage gain of this circuit is 10. Here is the circuit: Compared to traditional RF circuitry, this circuit is simpler. […]
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The 200 MHz JFET has same features below: 1. Low crossmodulation 2. Large-signal handling ability 3. No neutralization 4. AGC controlled by biasiing the upper cascade JFET. Here’s the circuit diagram: The Idss of the upper unit must be greater than the lower unit, that’s the only special requirement of the 200 MHz JFET. [Source: National Semiconductor Application Note]
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This is a simple JFET pierce crystal oscillator. We can use a wide frequency range of crystal using this circuit without circuit modification. Here is the circuit : This circuit uses Q, 2N3823, that is maintained thus insuring good stability of frequency because the crystal does not loaded by the JFET. [Source: National Semiconductor Application Note]
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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. The frequency-divider modulus N have value between 3 to 999 with single steps increment. In locked condition, […]
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