Common mode management between a current-steering DAC and transconductance filter in a transmission system
First Claim
Patent Images
1. A transmission circuit comprising:
- a current-steering DAC that provides an analog signal from an input digital signal;
a transconductance filter connected to the current-steering DAC, the transconductance filter receiving the analog signal and filtering the analog signal for transmission; and
a common mode circuit connected to the current-steering DAC and the transconductance filter that provides a reference signal to the current-steering DAC to provide common mode compatibility between the current-steering DAC and the transconductance filter.
2 Assignments
0 Petitions
Accused Products
Abstract
Common mode management between a DAC, such as a current-steering DAC, and a transconductance filter in a high-frequency transmission system. In one aspect of the invention, a transmission circuit includes a DAC that provides an analog signal from an input digital signal, and a filter such as a transconductance filter connected to the DAC, the filter receiving the analog signal and filtering the analog signal for transmission. A common mode management circuit connected to the DAC and the transconductance filter provides common mode compatibility in the interface connecting the DAC and the transconductance filter.
-
Citations
25 Claims
-
1. A transmission circuit comprising:
-
a current-steering DAC that provides an analog signal from an input digital signal; a transconductance filter connected to the current-steering DAC, the transconductance filter receiving the analog signal and filtering the analog signal for transmission; and a common mode circuit connected to the current-steering DAC and the transconductance filter that provides a reference signal to the current-steering DAC to provide common mode compatibility between the current-steering DAC and the transconductance filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A transmission circuit, comprising:
-
a current-steering DAC that provides a differential analog signal from an input digital signal; a transconductance filter that receives the differential analog signal and filters the differential analog signal for RF transmission, wherein a control voltage supplied to the transconductance filter is a tuning voltage auto-tuned with a frequency automatic tuning block connected to the transconductance filter; and a reference voltage generation circuit connected to the current-steering DAC and the transconductance filter that provides common mode compatibility between the current-steering DAC and the transconductance filter by generating a reference voltage input to the current-steering DAC based on the control voltage supplied to the transconductance filter. - View Dependent Claims (12, 13, 14)
-
-
15. A method for reducing distortion in a transmission circuit, comprising:
-
providing a common mode circuit connected to a current-steering DAC and to a transconductance filter, wherein the current-steering DAC provides an analog signal to the transconductance filter that filters the analog signal for transmission; and providing common mode compatibility between the current-steering DAC and the transconductance filter by matching an output common mode voltage of the current-steering DAC to an input common mode voltage of the transconductance filter at a transmission signal input of the transconductance filter. - View Dependent Claims (16, 17, 18, 19, 20)
-
-
21. A transmission circuit comprising:
-
a DAC that provides an analog signal from an input digital signal; a filter connected to the DAC, the filter receiving the analog signal and filtering the analog signal for transmission; and a common mode circuit connected to the DAC and the filter that provides a reference signal to the current-steering DAC to provide common mode compatibility between the DAC and the filter. - View Dependent Claims (22, 23, 24, 25)
-
Specification