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US 11,108,372 B2Granted
Compact balanced radio frequency balun facilitating easy integration
AssigneeIntegrated Device Technology, Inc.
InventorsChuying Mao, Ran Li
Life of this patent
Estimating the term…
Abstract
An apparatus comprises a first circuit and a second circuit. The first circuit generally comprises differential symmetric band extension circuitry. The second circuit generally comprises coupled inductor coils configured to convert between differential and single-ended signal formats.
Claims20
An apparatus comprising:
- a first circuit comprising differential symmetric band extension circuitry coupling a first differential input/output port to a differential output/input port, said differential symmetric band extension circuitry comprising a first inductor and a second inductor coupled in series between a first terminal of said first differential input/output port and a second terminal of said first differential input/output port;
- and
- a second circuit coupled to said differential output/input port of said first circuit by a second differential input/output port, said second circuit comprising a third inductor coupled to said second differential input/output port and a fourth inductor coupled to a single-ended output/input port, wherein said third inductor and said fourth inductor are configured as coupled inductor coils configured to convert between differential and single-ended signal formats.
A method of converting between differential and single-ended signals using a balun comprising the steps of:
- coupling a first inductor of said balun between a first terminal of a first differential input/output port and a second terminal of said first differential input/output port;
- coupling a first terminal of a second inductor of said balun to a single-ended output/input port and coupling a second terminal of said second inductor of said balun to a circuit ground potential using a first capacitor, wherein said first inductor and said second inductor are configured as coupled inductor coils configured to convert between differential and single-ended signal formats;
- sizing said coupled inductor coils of said balun to achieve a predetermined phase/amplitude balance at a high end of a predefined frequency band;
- configuring a differential shunt inductor by coupling a third inductor and a fourth inductor in series between a first terminal and a second terminal of a second differential input/output port;
- and
- coupling said first terminal of said second differential input/output port to a first terminal of said first differential input/output port using a second capacitor and coupling said second terminal of said second differential input/output port to a second terminal of said first differential input/output port using a third capacitor, wherein said differential shunt inductor, said second capacitor, and said third capacitor are configured to extend a low frequency response of said balun.
3 more elements
An apparatus comprising:
- a first circuit comprising (i) a differential input/output port, (ii) a differential output/input port, a first inductor, a second inductor, a first capacitor, and a second capacitor, wherein a first terminal of said differential input/output port is connected to a first terminal of said first inductor and a first terminal of said first capacitor, a second terminal of said differential input/output port is connected to a first terminal of said second inductor and a first terminal of said second capacitor, a second terminal of said first inductor and a second terminal of said second inductor are connected to at least one of a circuit ground potential or a first switch circuit, a second terminal of said first capacitor is connected to a first terminal of said differential output/input port, and a second terminal of said second capacitor is connected to a second terminal of said differential output/input port;
- and
- a second circuit comprising a second differential input/output port, a single-ended output/input port, a third inductor, and a fourth inductor, wherein a first terminal of said third inductor is connected to a first terminal of said second differential input/output port, a second terminal of said third inductor is connected to a second terminal of said second differential input/output port, a first terminal of said fourth inductor is connected to said single-ended output/input port, a second terminal of said fourth inductor is connected to the circuit ground potential via a third capacitor, and said third inductor and said fourth inductor are configured as coupled inductor coils configured to convert between differential and single-ended signal formats.
Dependencies are inferred from the claim text.