Power-adjustable solid-state radio frequency source

Abstract

The invention discloses a power-adjustable solid-state radio frequency source which comprises a signal generator, an output device and at least one stage of power amplifier. The power amplifier is connected between the output end of the signal generator and the input end of the output device, and the signal generator comprises an active crystal oscillator. The voltage input end of the active crystal oscillator is communicated with a continuously adjustable power supply voltage, the signal generator outputs continuously adjustable power of the crystal oscillator signal source to the power amplifier through the continuously adjustable power supply voltage, and the power amplifier amplifies the continuously adjustable power of the crystal oscillator signal source. And the amplified radio frequency power is output through the output device. The power-adjustable solid-state radio frequency source has the advantages of simple structure, cost saving, easy technology implementation, stable circuit performance and the like.

Description

technical field [0001] The invention relates to the technical field of solid-state radio frequency sources, in particular to a power-adjustable solid-state radio frequency source. Background technique [0002] Solid-state radio frequency sources have a wide range of applications in medical, scientific, industrial, consumer and other fields. With the intensification of market competition and the wide application of industries, cost performance is also one of the key considerations for solid-state radio frequency sources. In order to meet the technical applications of various industries, solid-state radio frequency sources often require continuous adjustment of power. [0003] The existing commonly used adjustment methods are usually the following: 1. figure 1 As shown, an adjustable gain amplifier is set between the primary power amplifier and the secondary power amplifier or between the signal source and the primary amplifying circuit, and the gain is controlled by a digita...

AI Technical Summary

Problems solved by technology

[0003] The existing commonly used adjustment methods are usually the following: 1. figure 1 As shown, an adjustable gain amplifier is set between the primary power amplifier and the secondary power amplifier or between the signal source and the primary amplifying circuit, and the gain is controlled by a digital signal or an analog signal. In this setting method, an additional adjustable Gain amplifier components complicate the circuit form and increase manufacturing costs

2. If figure 2 As shown, an electronically adjustable attenuator is set between the primary power amplifier and the secondary power amplifier or between the signal source and the primary amplifying circuit, and the attenuation is controlled by a digital signal or an analog signal. Adjusting the attenuator complicates the circuit form and increases the manufacturing cost

3. If image 3 As shown, the gate voltage of the first-stage amplifier and the second-stage amplifier are adjusted individually or jointly to adjust the gain of the entire amplification chain. However, the adjustment of the gate voltage brings about the adjustment of the static operating point, and the harmonic characteristics and stability Changes in sex, and in some cases even oscillations

4. If Figure 4 As shown, the drain voltage of the first-stage amplifier and the second-stage amplifier is adjusted individually or jointly to adjust the gain of the entire amplification chain. However, the drain voltage is provided by a high-power DC power supply. To realize the adjustment of the drain voltage, it is necessary Select output adjustable DC power supply, which increases more system cost

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