Cascaded amplifiers with transformer-based bypass mode
First Claim
1. An apparatus comprising:
- a first amplifier to provide amplification in a high gain mode and a bypass mode;
a second amplifier to provide amplification in the high gain mode; and
a circuit coupled between the first and second amplifiers and comprising a transformer, the transformer comprising a primary coil coupled to the first amplifier and a secondary coil that provides an output signal in the bypass mode.
1 Assignment
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Accused Products
Abstract
Cascaded amplifiers with a transformer-based bypass mode are described. In an exemplary design, an apparatus includes first and second amplifiers and a circuit. The first amplifier (e.g., a driver amplifier) provides amplification in a high gain mode and a bypass mode. The second amplifier (e.g., a power amplifier) provides amplification in the high gain mode. The circuit is coupled between the first and second amplifiers and includes a transformer having (i) a primary coil coupled to the first amplifier and (ii) a secondary coil that provides an output signal in the bypass mode. The primary coil may be a load inductor for the first amplifier. The circuit may further include a series combination of a capacitor and a switch coupled in parallel with the primary coil, a switch coupled in series with the secondary coil, and/or a capacitor coupled in parallel with the secondary coil.
78 Citations
25 Claims
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1. An apparatus comprising:
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a first amplifier to provide amplification in a high gain mode and a bypass mode; a second amplifier to provide amplification in the high gain mode; and a circuit coupled between the first and second amplifiers and comprising a transformer, the transformer comprising a primary coil coupled to the first amplifier and a secondary coil that provides an output signal in the bypass mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An integrated circuit comprising:
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a driver amplifier to provide amplification in a high gain mode and a bypass mode; a power amplifier to provide amplification in the high gain mode; and a circuit coupled between the driver amplifier and the power amplifier and comprising a transformer, the transformer comprises a primary coil coupled to the driver amplifier and further comprises a secondary coil that provides an output signal in the bypass mode. - View Dependent Claims (18, 19)
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20. A method of performing signal amplification, comprising:
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performing amplification with a first amplifier in a high gain mode and a bypass mode; performing amplification with a second amplifier in the high gain mode; and coupling the first amplifier to the second amplifier with a circuit comprising a transformer, the transformer comprises a primary coil coupled to the first amplifier and further comprises a secondary coil that provides an output signal in the bypass mode. - View Dependent Claims (21, 22, 23, 24)
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25. An apparatus comprising:
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means for performing amplification in a high gain mode and a bypass mode; means for performing additional amplification in the high gain mode; and means for coupling the means for performing amplification to the means for performing additional amplification, the means for coupling comprises transformer means having a primary side coupled to the means for performing amplification and a secondary side that provides an output signal in the bypass mode.
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Specification