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MICRF218AYQS Datasheet(PDF) 10 Page - Micrel Semiconductor |
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MICRF218AYQS Datasheet(HTML) 10 Page - Micrel Semiconductor |
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10 / 24 page  Micrel MICRF218 September 2007 10 M9999-090607 (408) 944-0800 Crystal AGC RF Amp mixer IF Amp SYNTHESIZER UHF Downconverter ANT CAGC fc REFERENCE OSCILLATOR Reference and Control SEL0 RO1 OOK Demodulator CTH DO VDD VSS mixer fLO IMAGE REJECT FILTER f -f i RSSI RSSI SEL1 DO SLICER SHDN RO2 Slicing Level Programmable Low Pass Filter CONTROL LOGIC Detector CONTROL LOGIC CONTROL LOGIC IF_BW IF_BW Wide / Narrow Figure 1 Simplified Block Diagram Functional Description Figure 1 illustrates the basic structure of the MICRF218. It is composed of three sub-blocks; Image Rejection UHF Down-converter with Switch-able Dual IF Bandwidths, the OOK Demodulator, and Reference and Control Logics. Outside the device, the MICRF218 requires only three components to operate: two capacitors (CTH, and CAGC) and the reference frequency device, usually a quartz crystal. Additional five components may be used to improve performance. These are: low cost linear regulator decoupling capacitor, two components for the matching network, and two components for the pre- selector band pass filter. Receiver Operation LNA The RF input signal is AC-coupled into the gate circuit of the grounded source LNA input stage. The LNA is a Cascoded NMOS. Mixers and Synthesizer The LO ports of the Mixers are driven by quadrature local oscillator outputs from the synthesizer block. The local oscillator signal from the synthesizer is placed on the low side of the desired RF signal to allow suppression of the image frequency at twice the IF frequency below the wanted signal. The local oscillator is set to 32 times the crystal reference frequency via a phase-locked loop synthesizer with a fully integrated loop filter. Image Reject Filter and IF Band-Pass Filter The IF ports of the mixer produce quadrature down converted IF signals. These IF signals are low-pass filtered to remove higher frequency products prior to the image reject filter where they are combined to reject the image frequencies. The IF signal then |
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