Amplifier With Compensated Gate Bias
An existing Japanese patent describes an amplifier for high-frequency signals. This amplifier contains a "gate bias stage," a sub-circuit intended to reduce variability in signal stemming from fluctuations in power. Naturally, amplifiers are prone to magnifying input errors. Various errors can arise in the process of harnessing direct current. This invention concerns the stabilization of the initial voltage to prevent noticeable variations in the amplified signal; it improves on that Japanese patent by adding a resistor.
This invention introduces an improvement into the gate bias stage of a high-frequency amplifier. The invention adds a supplementary resistor that goes into effect only if the input signal remains higher than a desired threshold. The extra resistor minimizes the effect of fluctuations in the power supply by eliminating the effects of variation above a certain level.
- Improve amplification process in situations where fluctuations in output would be functionally or aesthetically detrimental
- Compensate for particular variability in power supplies.
The invention describes a circuit designed to amplify high-frequency (Gigahertz range) signals. An extra resistor is added between two transistors in the bias sub-circuit. The resistor falls between the first transistor and the ground and intervenes at the negative power supply. A variation uses an additional resistor that affects the positive power supply. The invention also covers more complex variations.
License - Intellectual PropertyWO 2007/064201
Amplifier with compensated gate bias