GB1341182A - Notch rejection filter - Google Patents
Notch rejection filterInfo
- Publication number
- GB1341182A GB1341182A GB1341182DA GB1341182A GB 1341182 A GB1341182 A GB 1341182A GB 1341182D A GB1341182D A GB 1341182DA GB 1341182 A GB1341182 A GB 1341182A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- filter
- filters
- phase shift
- degrees
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H19/00—Networks using time-varying elements, e.g. N-path filters
- H03H19/002—N-path filters
Abstract
1341182 Active filters HUGHES AIRCRAFT CO 14 Sept 1972 42648/72 Heading H3U A notch filter comprises: an input 11 at which is applied an input signal with a number of frequency components including a selected one to be rejected; a source of clock pulses 22; a filter 15 responsive to the clock signal to select, from the input signal, the signal to be rejected, and to phase shift it; and means to combine the input signal with the phase shifted selected signal to produce a signal at output 12 having the selected signal attenuated by a substantial factor. The phase shifting is 180 degrees and is effected by pre- and post-filters 13, 18 each producing 90 degrees phase shift. Alternatively three filters having 60 degrees phase shift may be used. The filter 15 is an n-path filter, Fig. 2, having a series resistor R and shunt capacitors C1 .... C6 associated with switches S1 ....S6 which are driven by the clock source.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4264872 | 1972-09-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1341182A true GB1341182A (en) | 1973-12-19 |
Family
ID=10425360
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1341182D Expired GB1341182A (en) | 1972-09-14 | 1972-09-14 | Notch rejection filter |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1341182A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2500067A (en) * | 2012-03-09 | 2013-09-11 | Renesas Mobile Corp | An N-path filter for notching out unwanted signals in wireless receivers |
| US9136825B2 (en) | 2012-06-13 | 2015-09-15 | Nokia Technologies Oy | Method and device for implementing tracking filters and RF front end of software defined radios |
-
1972
- 1972-09-14 GB GB1341182D patent/GB1341182A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2500067A (en) * | 2012-03-09 | 2013-09-11 | Renesas Mobile Corp | An N-path filter for notching out unwanted signals in wireless receivers |
| US9136825B2 (en) | 2012-06-13 | 2015-09-15 | Nokia Technologies Oy | Method and device for implementing tracking filters and RF front end of software defined radios |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |