US7834703B2
Active / In Force
US
⏱️ 1.8 years remaining
Amplifier with single-ended input and differential output
Assignee: Texas Instruments Inc
•
Filing: 2008-08-19
•
Granted: 2010-11-16
•
Expires: 2028-08-19
Abstract
Abstract An amplifier provided according to an aspect of the present invention includes a set of passive impedances forming a tuned load to a gain stage and also to provide a 180 degrees phase shifted signal of a gain signal received from the gain stage. The output of the gain stage and the 180 degrees phase shifted signal together form a differential amplified signal corresponding to an input signal gained by the gain stage. In an embodiment, the set of passive impedances includes a three terminal centre tapped inductor in combination with a capacitor, together operating as a filter to pass only a desired frequency band. The windings of the inductor may be designed to provide mutual coupling between two portions such that there is a negative correlation between the strength of the received gained signal and the 180 degree phase shifted signal.
Inventors
- 👤 Saravana Kumar Ganeshan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:19
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/189; H03F3/19; H03F3/193; H03F1/00; H03F1/08; H03F1/22; H03F1/223; H04; H04L; H04L27/00; H04L27/0002; H04L27/02; H04L27/08; H03F2200/00; H03F2200/108; H03F2200/294; H03F2200/492; H03F2200/541; H04L25/00; H04L25/02; H04L25/0264; H04L25/0278
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
97 words
An amplifier to amplify an input signal in a single ended form and generate an amplified output signal in differential form on a pair of output paths, said amplifier comprising: a gain stage coupled to receive said input signal and to provide a gained signal on a first output path contained in said pair of output paths; and a pair of mutually coupled inductors coupled to receive said gained signal and to provide a signal 180 degrees phase shifted with respect to said gain signal on a second output path contained in said pair of output paths.
Claim 2
Dependent Claim
97 words
An amplifier to amplify an input signal in a single ended form and generate an amplified output signal in differential form on a pair of output paths, said amplifier comprising: a gain stage coupled to receive said input signal and to provide a gained signal on a first output path contained in said pair of output paths; and a pair of mutually coupled inductors coupled to receive said gained signal and to provide a signal 180 degrees phase shifted with respect to said gain signal on a second output path contained in said pair of output paths.
Claim 3
Dependent Claim
151 words
An amplifier to amplify an input signal in a single ended form and generate an amplified output signal in differential form on a pair of output paths, said amplifier comprising: a gain stage coupled to receive said input signal and to provide a gained signal on a first output path contained in said pair of output paths; and a set of passive impedances coupled to said first output path and to provide a tuned load to said gain stage such that only a desired band of frequencies contained in said input signal are received on said first output path, said set of passive impedances further designed to provide a second signal 180 degrees phase shifted with respect to said gain signal on a second output path contained in said pair of output paths, whereby said gained signal and said second signal together represent said amplified output signal in said differential form.
Claim 4
Dependent Claim
151 words
An amplifier to amplify an input signal in a single ended form and generate an amplified output signal in differential form on a pair of output paths, said amplifier comprising: a gain stage coupled to receive said input signal and to provide a gained signal on a first output path contained in said pair of output paths; and a set of passive impedances coupled to said first output path and to provide a tuned load to said gain stage such that only a desired band of frequencies contained in said input signal are received on said first output path, said set of passive impedances further designed to provide a second signal 180 degrees phase shifted with respect to said gain signal on a second output path contained in said pair of output paths, whereby said gained signal and said second signal together represent said amplified output signal in said differential form.
Claim 5
Dependent Claim
137 words
The amplifier of claim 2 , wherein said set of passive impedances comprise: a capacitor having two terminals, a first terminal of said capacitor being coupled to a first node also coupled to said first output path, a second terminal of said capacitor being coupled to a second node also coupled to said second output path; a first inductor and a second inductor each having a corresponding first terminal coupled to a first reference potential, and a second terminal of said first inductor coupled to said first node and a second terminal of said second inductor coupled to said second node, said first inductor and said second inductor being mutually coupled with a coupling sense such that an increase of strength of a signal on said first node causes a reduction in strength on said second node.
Claim 6
Dependent Claim
40 words
The amplifier of claim 3 , wherein said capacitor is provided in the form of a plurality of capacitors connected in series, and a junction of a pair of said plurality of capacitors being connected to a second reference potential.
Claim 7
Dependent Claim
51 words
The amplifier of claim 3 , wherein said first inductor and said second inductor are provided in the form of single three terminal centre-tapped inductor with one terminal being connected to said first reference potential and the remaining two terminals being respectively connected to said first node and said second node.
Claim 8
Dependent Claim
21 words
The amplifier of claim 3 , further comprising a matching block to provide a matched impedance path to said input signal.
Claim 9
Dependent Claim
25 words
The amplifier of claim 3 , wherein said gain stage is provided in the form of a set of transistors connected in a cascode connection.
Claim 10
Dependent Claim
170 words
A receiver comprising: an antenna to receive an input signal and provide said input signal in single-ended form; and an amplifier to amplify said input signal in a single ended form and generate an amplified output signal in differential form on a pair of output paths, said amplifier comprising: a gain stage coupled to receive said input signal and to provide a gained signal on a first output path contained in said pair of output paths; and a set of passive impedances coupled to said first output path and to provide a tuned load to said gain stage such that only a desired band of frequencies contained in said input signal are received on said first output path, said set of passive impedances further designed to provide a second signal 180 degrees phase shifted with respect to said gain signal on a second output path contained in said pair of output paths, whereby said gained signal and said second signal together represent said amplified output signal in said differential form.
Claim 11
Dependent Claim
170 words
A receiver comprising: an antenna to receive an input signal and provide said input signal in single-ended form; and an amplifier to amplify said input signal in a single ended form and generate an amplified output signal in differential form on a pair of output paths, said amplifier comprising: a gain stage coupled to receive said input signal and to provide a gained signal on a first output path contained in said pair of output paths; and a set of passive impedances coupled to said first output path and to provide a tuned load to said gain stage such that only a desired band of frequencies contained in said input signal are received on said first output path, said set of passive impedances further designed to provide a second signal 180 degrees phase shifted with respect to said gain signal on a second output path contained in said pair of output paths, whereby said gained signal and said second signal together represent said amplified output signal in said differential form.
Claim 12
Dependent Claim
138 words
The receiver of claim 8 , wherein said set of passive impedances further comprise: a capacitor having two terminals, a first terminal of said capacitor being coupled to a first node also coupled to said first output path, a second terminal of said capacitor being coupled to a second node also coupled to said second output path; a first inductor and a second inductor each having a corresponding first terminal coupled to a first reference potential, and a second terminal of said first inductor coupled to said first node and a second terminal of said second inductor coupled to said second node, said first inductor and said second inductor being mutually coupled with a coupling sense such that an increase of strength of a signal on said first node causes a reduction in strength on said second node.
Claim 13
Dependent Claim
40 words
The receiver of claim 9 , wherein said capacitor is provided in the form of a plurality of capacitors connected in series, and a junction of a pair of said plurality of capacitors being connected to a second reference potential.
Claim 14
Dependent Claim
51 words
The receiver of claim 9 , wherein said first inductor and said second inductor are provided in the form of single three terminal centre-tapped inductor with one terminal being connected to said first reference potential and the remaining two terminals being respectively connected to said first node and said second node.
Claim 15
Dependent Claim
21 words
The receiver of claim 9 , further comprising a matching block to provide a matched impedance path to said input signal.
Claim 16
Dependent Claim
25 words
The receiver of claim 9 , wherein said gain stage is provided in the form of a set of transistors connected in a cascode connection.
Claim 17
Dependent Claim
93 words
The receiver of claim 13 , further comprising: a mixer to receive said amplified output signal in said differential form, and to convert said output signal to a lower frequency band; an intermediate frequency (IF) block to further process said output signal converted to said lower frequency band to provide a final down-converted signal; an analog to digital converter (ADC) to generate digital codes representing the strength of said final down-converted signal at corresponding sampling time instances; and a processor processing said digital codes to perform a desired operation using said digital codes.
Claim 18
Dependent Claim
16 words
The receiver of claim 14 , wherein said receiver is a Global Positioning System (GPS) receiver.
References Cited (Backward Citations)
US7224231B2
Cited
US7538618B2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2013-11-15 | 2014-05-17 | 2014-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2017-11-15 | 2018-05-17 | 2018-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2021-11-15 | 2022-05-17 | 2022-11-16 | $7700.00 | Window Closed / Lapsed |