Three-order low-pass Gm-C filter for multi-mode zero intermediate frequency receiver
The present invention discloses a three-order low-pass Gm-C filter for a multi-mode zero intermediate frequency receiver. The filter comprises a first transconductance amplifier module, a second transconductance amplifier module and eight switches. The first transconductance amplifier module and the...
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| Format: | Patent |
| Sprache: | chi ; eng |
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| Zusammenfassung: | The present invention discloses a three-order low-pass Gm-C filter for a multi-mode zero intermediate frequency receiver. The filter comprises a first transconductance amplifier module, a second transconductance amplifier module and eight switches. The first transconductance amplifier module and the second transconductance amplifier module are connected in parallel. The first transconductance amplifier module comprises six transconductance amplifiers and six capacitance modules. The second transconductance amplifier module comprises six transconductance amplifiers. When the switch controls the first and the second transconductance amplifier modules to disconnect, the filter of the present invention works in a low frequency adjustment mode; and when the switch controls the second transconductance amplifier module and the first transconductance amplifier module to connect in parallel, the filter of the present invention works in a high frequency adjustment mode. In adjustment of a cut-off frequency, the filter |
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