System and method for adjusting group delay
View Patent ↗A group delay adjusting circuit. The group delay adjusting circuit comprises an electronically adjustable variable capacitance, and an electronically variable virtual inductor coupled in parallel to the electronically variable capacitance at a node.
1. A feedforward amplifier comprising:
a main amplifier gain path including a first group delay adjuster having a virtual inductor; and
an error amplifier gain path including a second group delay adjuster having a virtual inductor having an output coupled to an output of the main amplifier gain path,
wherein each of the virtual inductors includes a quarter wavelength transmission line coupled to a variable shunt capacitor.
2. The feed forward amplifier of claim 1 , in which the main amplifier gain path comprises the first group delay adjuster having a virtual inductor having an output coupled to an input of a first phase and gain adjuster and a first phase and gain adjuster output coupled to an input of a main amplifier.
3. The feed forward amplifier of claim 1 , in which the error amplifier gain path comprises the second group delay adjuster having a virtual inductor having an output coupled to an input of a second phase and gain adjuster and a second phase and gain adjuster output coupled to an input of an error amplifier.