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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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RF63 데이터시트(PDF) 18 Page - List of Unclassifed Manufacturers |
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RF63 데이터시트(HTML) 18 Page - List of Unclassifed Manufacturers |
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18 / 91 page  ADVANCED COMMUNICATIONS & SENSING Page 18 of 91 RF63 Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: sales@hoperf.com http://www.hoperf.com 3.3. Transmitter Description The RF63 is set to transmit mode when MCParam_Chip_mode = 100. 3.3.1. Architecture Description The baseband I and Q signals are digitally generated by a DDS whose digital to analog converters (DAC) followed by two anti-aliasing low-pass filters transform the digital signal into analog in-phase (I) and quadrature (Q) components whose frequency is the selected frequency deviation (Fdev). 1 Fdev I(t) Q(t) Figure 9: I(t), Q(t) Overview In FSK mode, the relative phase of I and Q is switched by the input data between -90°and +90°with co ntinuous phase. The modulation is therefore performed at this initial stage, since the information contained in the phase difference will be converted into a frequency shift when the I and Q signals are up-converted in the first mixer stage. This first up-conversion stage is duplicated to enhance image rejection. The FSK convention is such that: |
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