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References in periodicals archive ?
Moritake, "Increasing the speed of microstrip-line-type polymer-dispersed liquid-crystal loaded variable phase shifter," IEEE Transactions on Microwave Theory and Techniques, vol.
It requires an additional variable phase shifter to change phase shifts between the voltage and current.
This can be done by including a variable phase shifter in the LO path.
Because active multipliers attenuate [f.sub.o] theoretically, [f.sub.o] can be suppressed further by adjusting the coupling coefficient of the couplers, which are located before and after the multiplier, and the phase of the variable phase shifter. (9) To have perfect cancellation of [f.sub.o], the magnitude and phase of the two signals must be equal and out-of-phase at the output coupler of the feedforward structure.
The IM[G.sub.3] and IM[G.sub.h] control blocks consist of a variable attenuator and a variable phase shifter to control the magnitude and phase of the third and higher order inverse IM signals to the HPA.
A simple way to understand the operation of the mixer as a phase detector is to feed its LO and RF ports with the same signal with a variable phase shifter at one of these ports.
The predistortion circuit consists of a power divider, an automatic level controller (ALC), the LI[M.sub.2], a mixer, a variable attenuator and a variable phase shifter. The input two-tone signals are divided into the power amplifier path and ALC path through the power divider.
The phase comparator (PC) consists of two-magnitude comparators and furnishes a voltage ([V.sub.[[PHI]1]]) to the variable phase shifter ([[PHI].sub.1]) so that the phase of two signal paths to the subtracter are out-of-phase.
The variable phase shifter is a reflection type hybrid phase shifter using varactor diodes (11), which has about 120[degrees] of adjustable phase control range.
In a case where the VCO output frequency is too low, a continuously variable phase shifter cannot be obtained.
Variable attenuation is included in the circuit to enable the output level to be precisely adjusted to match the input reference, while the variable phase shifter adjusts the power amplifier output in an antiphase arrangement with the input reference.
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