Digital tunable inter-stage matching circuit
First Claim
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1. An apparatus comprising:
- a driver amplifier;
a power amplifier;
an inter-stage matching circuit tunable in discrete steps for matching impedances between the driver amplifier and the power amplifier, the tunable inter-stage matching circuit including a bank of capacitors, a fixed capacitor coupled in series between the driver amplifier and the bank of capacitors, and a first inductor coupled to and in series between the power amplifier and the bank of capacitors, each capacitor of the bank coupled in series with a switch for coupling the capacitor to a ground voltage; and
a second inductor coupled between the driver amplifier and the inter-stage matching circuit and the first inductor coupled between the inter-stage matching circuit and the power amplifier.
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Abstract
A tunable inter-stage matching circuit that can improve performance is described. In an exemplary design, an apparatus comprises a driver amplifier and a power amplifier. The apparatus may further include an inter-stage matching circuit tunable in discrete steps for matching impedances between the driver amplifier and the power amplifier. The tunable inter-stage matching circuit may include a bank of capacitors, each capacitor of the bank coupled in series with a switch for coupling the capacitor to a ground voltage.
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Citations
19 Claims
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1. An apparatus comprising:
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a driver amplifier; a power amplifier; an inter-stage matching circuit tunable in discrete steps for matching impedances between the driver amplifier and the power amplifier, the tunable inter-stage matching circuit including a bank of capacitors, a fixed capacitor coupled in series between the driver amplifier and the bank of capacitors, and a first inductor coupled to and in series between the power amplifier and the bank of capacitors, each capacitor of the bank coupled in series with a switch for coupling the capacitor to a ground voltage; and a second inductor coupled between the driver amplifier and the inter-stage matching circuit and the first inductor coupled between the inter-stage matching circuit and the power amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method, comprising:
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receiving a signal from a first circuit and conveying another signal to a second circuit; and matching an impedance between the first circuit and the second circuit with an inter-stage matching circuit tunable in discrete steps and comprising a plurality of switchable capacitors in a parallel configuration, a fixed capacitor coupled in series between the first circuit and the bank of capacitors, and a first inductor coupled to and in series between the second circuit and the plurality of switchable capacitors, each switchable capacitor configured to be coupled to a ground voltage via a switchable element, and a second inductor coupled between the first circuit and the inter-stage matching circuit and the first inductor coupled between the inter-stage matching circuit and the second circuit. - View Dependent Claims (13, 14, 15, 16)
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17. A device comprising:
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means for receiving a signal from a first circuit and conveying another signal to a second circuit; and means for matching an impedance between the first circuit and the second circuit with an inter-stage matching circuit tunable in discrete steps and comprising a plurality of switchable capacitors in a parallel configuration, a fixed capacitor coupled in series between the first circuit and the bank of capacitors, and a first inductor coupled to and in series between the second circuit and the plurality of switchable capacitors, each switchable capacitor configured to be coupled to a ground voltage via a switchable element, and a second inductor coupled between the first circuit and the inter-stage matching circuit and the first inductor coupled between the inter-stage matching circuit and the second circuit. - View Dependent Claims (18, 19)
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Specification