Hybrid transmitter architecture having high efficiency and large dynamic range
AssigneeInterDigital Technology Corporation
InventorsTanbir Haque, Leonid Kazakevich
Life of this patent
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Abstract
An adaptive hybrid transmitter architecture for use in a communication unit which dynamically adapts to maximize efficiency, delivers a large dynamic range and provides good distortion performance depending upon the required output power of the transmitter. In the upper portion of the operating range, the hybrid transmitter operates in a sigma delta mode including a noise shaping feedback loop. In the middle portion of the operating range, the transmitter operates in a Cartesian correction mode for error correction. At the lower portion of the operating range, the amplifier is operated in a linear mode, without feedback.
Claims69
An adaptive hybrid transmitter for transmitting a radio frequency (RF) signal within an established power output level operating range, the transmitter being configured to selectively operate in an upper portion of the operating range, a middle portion of the operating range, and a lower portion of the operating range, the transmitter comprising:
- (a) an in-phase (I) signal path;
- (b) a quadrature (Q) signal path;
- (c) a first summer inserted in the I signal path;
- (d) a second summer inserted in the Q signal path;
- (e) an upconverter having a first input connected to the I signal path, a second input connected to the Q signal path, and an output for outputting an upconverted signal derived from signals received on the I and Q signal paths;
- (f) at least one amplifier which amplifies the upconverted signal;
- (g) a coupler in communication with the upconverted signal output of the upconverter, the coupler having a direct output and a coupled output;
- and
- (h) a feedback unit having an input in communication with the coupled output of the coupler and two switchable outputs in communication with respective inputs of the first summer and the second summer.
A wireless transmit/receive unit (WTRU) for transmitting a radio frequency (RF) signal within an established power output level operating range, the WTRU being configured to selectively operate in an upper portion of the operating range, a middle portion of the operating range, and a lower portion of the operating range, the WTRU comprising:
- (a) an in-phase (I) signal path;
- (b) a quadrature (Q) signal path;
- (c) a first summer inserted in the I signal path;
- (d) a second summer inserted in the Q signal path;
- (e) an upconverter having a first input connected to the I signal path, a second input connected to the Q signal path, and an output for outputting an upconverted signal derived from signals received on the I and Q signal paths;
- (f) at least one amplifier which amplifies the upconverted signal;
- (g) a coupler in communication with the upconverted signal output of the upconverter, the coupler having a direct output and a coupled output;
- and
- (h) a feedback unit having an input in communication with the coupled output of the coupler and two switchable outputs in communication with respective inputs of the first summer and the second summer.
An integrated circuit incorporated in a transmitter for transmitting a radio frequency (RF) signal within an established power output level operating range, the IC being configured to selectively operate in an upper portion of the operating range, a middle portion of the operating range, and a lower portion of the operating range, the IC comprising:
- (a) an in-phase (I) signal path;
- (b) a quadrature (Q) signal path;
- (c) a first summer inserted in the I signal path;
- (d) a second summer inserted in the Q signal path;
- (e) an upconverter having a first input connected to the I signal path, a second input connected to the Q signal path, and an output for outputting an upconverted signal derived from signals received on the I and Q signal paths;
- (f) at least one amplifier which amplifies the upconverted signal;
- (g) a coupler in communication with the upconverted signal output of the upconverter, the coupler having a direct output and a coupled output;
- and
- (h) a feedback unit having an input in communication with the coupled output of the coupler and two switchable outputs in communication with respective inputs of the first summer and the second summer.
Dependencies are inferred from the claim text.