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US 6,856,215 B2Granted
System and method for adjusting group delay
AssigneePowerwave Technologies, Inc.
InventorsMark Gurvich, Alex Rabinovich, Nikolai Maslennikov, Jianqing He
Life of this patent
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Abstract
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.
Claims11
A group delay adjusting circuit comprising:
- a first stub matching structure coupled to a microstrip input transmission line;
- a first DC blocking capacitor having a first terminal coupled to the microstrip input transmission line, and a second terminal;
- a main transmission line having a first terminal coupled to the second terminal of the first DC blocking capacitor, a second terminal, a third terminal along its length, a fourth terminal along its length, and a fifth terminl along its length;
- a first varactor diode having a first terminal coupled to the fifth terminal of the main transmission line, and a second terminal coupled to a ground;
- a first high impedence line having a first terminal coupled to the third terminal of the main transmission line, and a second terminal;
- a first RF by pass capacitor having a first terminal coupled to the second terminal of the first high impedance line and a first signal input pad, and a second terminal coupled to ground;
- a second DC blocking capacitor having a first terminal coupled to the second terminal of the main transmission line, and a second terminal;
- a second stub matching structure coupled to a microstrip output transmission line, and to the second terminal of the second DC blocking capacitor;
- a third DC blocking capacitor having a first terminal coupled to the fourth terminal of the main transmission line, and a second terminal;
- a transmission line of a quarter wavelength at a frequency of operation having a first terminal at a first end coupled to the second terminal to the third DC blocking capacitor, a second terminal at a second end, and a third terminal along its length;
- a second varactor diode having a first terminal coupled to the second terminal of the transmission line of a quarter wavelength at a frequency of operation, and a second terminal coupled to the ground;
- a second high impedance transmission line having a first terminal coupled to the third terminal of the transmission line of a quarter wavelength at a frequency of operation, and a second terminal;
- and
- a second RF bypass capacitor having a first terminal coupled to the second terminal of the high impedance transmission line and to a second signal input pad, and a second terminal coupled to the ground.
11 more elements
A group delay adjusting circuit comprising:
- a first stub matching structure coupled to a microstrip input transmission line;
- a first DC blocking capacitor having a first terminal coupled to the microstrip input transmission line, and a second terminal;
- a main transmission line having a first terminal coupled to the second terminal of the first DC blocking capacitor, a second terminal, a third terminal along its length, a fourth terminal along its length, and a fifth terminal along its length;
- a first varactor diode having a first terminal coupled to the fifth terminal of the main transmission line, and a second terminal coupled to a ground;
- a second DC blocking capacitor having a first terminal coupled to the third terminal of the main transmission line, and having a second terminal;
- a second stub matching structure coupled to the second terminal of the second DC blocking capacitor;
- a third DC blocking capacitor having a first terminal coupled to the fourth terminal of the main transmission line, and having a second terminal;
- a T-shaped microstrip structure having a first terminal coupled to the second terminal of the third DC blocking capacitor, a second terminal and a third terminal;
- a first resistor having a first terminal coupled to the second terminal of the T-shaped microstrip structure, and a second terminal;
- a first RF by pass capacitor having a first terminal coupled to the second terminal of the first resistor and a first signal input pad, and having a second terminal coupled to ground;
- an inductor having a first terminal coupled to the third terminal of the T-shaped microstrip structure and having a second terminal;
- a second varactor diode having a first terminal coupled to the second terminal of the inductor, and a second terminal coupled to the ground;
- a second resistor having a first terminal coupled to the fifth terminal of the microstrip output transmission line, and having a second terminal;
- and
- a second RF bypass capacitor having a first terminal coupled to the second terminal of the second resistor and to a second signal input pad, and having a second terminal coupled to the ground.
12 more elements
A method of adjusting a group delay adjusting circuit comprising:
- applying a signal to the group delay adjusting circuit
- applying a capacitive control signal to adjust a first variable capacitance;
- adjusting the first variable capacitance by applying the capacitive control signal to the first variable capacitance;
- applying an inductive control signal to a second variable capacitance;
- and
- adjusting the second variable capacitance by applying the inductive control signal to the second variable capacitance
- measuring a group delay of the signal prior to the step of adjusting the first variable capacitance.
4 more elements
A variable inductance circuit comprising
- a virtual inductor;
- and
- a bias network coupled to the virtual inductor, wherein the bias network comprises:
- a series impedance including a first terminal coupled to the quarter wavelength transmission line at a high impedance point and a second terminal coupled to an inductive control signal;
- a first shunt capacitance having a first terminal coupled to the second terminal of the transmission line, and a second terminal coupled to a ground.
2 more elements
Dependencies are inferred from the claim text.