Input drive configuration for reducing phase and gain imbalance
AssigneeTexas Instruments Incorporated
InventorAshwin Ravi
Life of this patent
Estimating the term…
Abstract
An analog front end device comprises three transformers. A first transformer has a first input configured to receive an input signal and first and second outputs. The second and third transformers comprise a secondary stage coupled to the first and second outputs. The second transformer has a second input coupled to the first output, a third output coupled to a first device output, and a fourth output coupled to a second device output. The third transformer has a third input coupled to the second output, a fifth output coupled to the second device output, and a sixth output coupled to the first device output. The phase imbalances of the second and third transformers are substantially the same, and the amplitude imbalances of the second and third transformers are substantially the same.
Claims21
An apparatus, comprising:
- a first transformer comprising a first primary winding and a first secondary winding, wherein the first primary winding is coupled to ground and configured to receive an input signal at an input node, wherein the first secondary winding is coupled to a first node and to a second node;
- a second transformer comprising a second primary winding and a second secondary winding, wherein the second primary winding is directly coupled to ground and directly coupled to the first node, wherein the second secondary winding is coupled to a first output node and to a second output node;
- and
- a third transformer comprising a third primary winding and a third secondary winding, wherein the third primary winding is directly coupled to ground and directly coupled to the second node, wherein the third secondary winding is coupled to the first output node and to the second output node.
An input drive configuration, comprising:
- a transformer comprising a first primary winding coupled to ground and configured to receive an input signal at an input node and a first secondary winding;
- and
- a secondary stage coupled to the first secondary winding, comprising:
- a first balun transformer comprising a second primary winding and a second secondary winding, wherein the second primary winding is directly coupled to ground and directly coupled to a first output of the first secondary winding, wherein a first output of the second secondary winding is coupled to a first output node and a second output of the second secondary winding is coupled to a second output node;
- and
- a second balun transformer comprising a third primary winding and a third secondary winding, wherein the third primary winding is directly coupled to ground and directly coupled to a second output of the first secondary winding, wherein a first output of the third secondary winding is coupled to the second output node and a second output of the third secondary winding is coupled to the first output node.
An analog front-end device, comprising:
- a transformer having a first input configured to receive an input signal, a first output, and a second output;
- and
- a secondary stage coupled to the first and second outputs, comprising:
- a first balun transformer having a second input directly coupled to the first output, a third output coupled to a first device output, and a fourth output coupled to a second device output, and
- a second balun transformer having a third input directly coupled to the second output, a fifth output coupled to the second device output, and a sixth output coupled to the first device output,
- wherein a phase imbalance of the first balun transformer is substantially the same as a phase imbalance of the second balun transformer, and wherein an amplitude imbalance of the first balun transformer is substantially the same as an amplitude imbalance of the second balun transformer.
Dependencies are inferred from the claim text.