RF Multiband Transmitter with Balun
AssigneeFreescale Semiconductor, Inc.
InventorsAmit D. Bavisi, Walter J. Grandfield, Darioush Keyvani, Mark A. Kirschenmann
Life of this patent
Estimating the term…
Abstract
A multi-band RF transmitter circuit (30) for a wireless communication device combines a plurality of RF transmission blocks into a single transceiver integrated circuit which includes a shared broadband SVGA (32), a shared tunable balun (34), and an output switching network (38) at the output of the balun to support three different frequency bands. The outputs of the multi-band RF transmitter circuit are connected to separate external power amplifier circuits (42-44), where each power amplifier circuit generates an amplified signal for one of the plurality of predetermined frequency bands.
Claims20
A multi-band RF transmitter circuit for a wireless communication device, comprising:
- a shared preamplifier connected to receive a transmit signal and generate an amplified transmit signal at any of a plurality of predetermined frequency bands;
- a shared tunable balun connected to receive the amplified transmit signal and to generate a balun output signal at any of the plurality of predetermined frequency bands;
- and
- an output switching network configured to connect the balun output signal to any of a plurality of power amplifier circuits which correspond respectively to the plurality of predetermined frequency bands.
A radio frequency (RF) transmitter adapted to operate in at least two transmission bands, comprising:
- a gain amplifier which may be configured to provide a plurality of gain values comprising a first gain value and a second gain value to an input RF signal, where the first gain value corresponds to a first selected transmission band and the second gain value corresponds to a second selected transmission band;
- a tunable balun connected to an output of the gain amplifier which may be tuned to provide a plurality of center frequencies comprising a first center frequency and a second center frequency, where the first center frequency corresponds to the first selected transmission band and the second center frequency corresponds to the second selected transmission band;
- a output switch connected between an output of the tunable balun and a plurality of RF power amplifiers to connect the output of the tunable balun to a first RF power amplifier for transmission on the first selected transmission band, and to connect the output of the tunable balun to a second RF power amplifier for transmission on the second selected transmission band.
A circuit comprising:
- a first multi-band transmitter comprising:
- a first configurable gain amplifier for receiving and amplifying a first input RF signal;
- a first tunable balun connected to an output of the first configurable gain amplifier having a center frequency that can be selectively tuned to different transmission bands;
- and
- a first output switch circuit connected between an output of the first tunable balun and a first plurality of power amplifiers;
- where the first multi-band transmitter may be configured to generate an RF transmission signal at any one of a first plurality of selectable transmission bands.
Dependencies are inferred from the claim text.