Attenuator De-Qing Loss Improvement and Phase Balance
AssigneePeregrine Semiconductor Corporation
InventorVikas Sharma
Life of this patent
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Abstract
The de-Qing loss and phase imbalance caused by the inherent capacitance of a switched resistance, such as a MOSFET with a resistor, can be reduced by using a shunting switch across the resistor that is in series with the resistor's switch. The shunting switch shorts across the resistor when the resistor's switch is open and in reference mode, thereby significantly reducing the resistance in series with the inherent capacitance of the open resistor's switch.
Claims23
A circuit comprising:
- a resistive element connected to an input terminal;
- a primary switching element in series with the resistive element;
- and
- a shunting switching element placed across the resistive element such that it would short current around the resistive element;
- wherein the shunting switching element is configured to be closed when the primary switching element is open, and the shunting switching element is configured to be open when the primary switching element is closed.
A method of reducing de-Qing loss for a circuit, said circuit comprising a resistive element connected to an input signal and a primary switching element in series with the resistive element and a shunting switching element across the resistive element, the method comprising:
- opening the shunting switching element when the primary switching element is closed;
- and
- closing the shunting switching element when the primary switching element is open.
A polyphase filter circuit comprising:
- parallel filter elements comprising a resistor and a capacitor;
- a primary switch in series with the resistor and the capacitor;
- and
- a shunting switch in parallel with the resistor and the capacitor, configured to short across the combination of the resistor and the capacitor when the shunting switch is closed.
A method of fabricating switchable attenuation circuit with deQing loss reduction, the method comprising:
- providing a resistive element connected to an input terminal;
- providing a primary switching element in series with the resistive element;
- and
- providing a shunting switching element placed across the resistive element such that it would short current around the resistive element;
- configuring the circuit such that the shunting switching element is closed when the primary switching element is open, and the shunting switching element is open when the primary switching element is closed.
Dependencies are inferred from the claim text.