| 摘要 |
A low power radio frequency receiver comprises: an antenna (102) for receiving a first radio frequency signal; a radio frequency amplifier (105) for amplifying the first radio frequency signal received by said antenna; an oscillator (1 15) for generating a second radio frequency signal having a predefined frequency and a predefined duty cycle to be mixed with said first radio frequency signal received by said antenna; a mixer (1 10) for mixing the first amplified radio frequency signal with second radio frequency signals and generating a third radio frequency signal; an intermediate frequency filter (120) for passing one or more intermediate frequencies of said third radio frequency signal and attenuating other frequencies of said third signal that are lower or higher than its cutoff frequencies, characterized in that it further comprises: one or more switches (212, 214) for periodically and synchronously switching ON and OFF one or more of said radio frequency amplifier, said oscillator, and said mixer, said switches controlled by means of a control signal having a frequency that is higher than the frequency of data embedded within said first radio frequency signal; and a control unit (225) located within said radio frequency receiver for providing said control signal, wherein each of said switches is connected to a corresponding capacitor (CM2) within said radio frequency amplifier, or oscillator, or mixer, said capacitor storing an operating point of said radio frequency amplifier, or oscillator, or mixer when said radio frequency amplifier, or oscillator, or mixer is switched OFF. |
