AN1993 High sensitivity applications of low-power RF/IF integrated circuits Rev. 3 13 August 2014 Application note Document information Info Content Keywords 12 dB SINAD, 20 dB SINAD, crystal filter, ceramic filter, VHF, UHF, image frequency, FM broadcast receiver, ASK, FSK Abstract This application note discusses four high sensitivity receivers and Intermediate Frequency (IF) strips that utilize intermediate frequencies of 10.7 MHz or greater. Each circuit utilizes a low-power VHF mixer and high-performance low-power IF strip. The circuit configurations are: 45 MHz or 49 MHz to 10.7 MHz narrowband 90 MHz to 21.4 MHz narrowband 100 MHz to 10.7 MHz wideband and 152.2 MHz to 10.7 MHz narrowband. Each circuit is presented with an explanation of component selection criteria (to permit adaptation to other frequencies and bandwidths). Optional configurations for local oscillators and data demodulators are summarized.AN1993 NXP Semiconductors High sensitivity applications of low-power RF/IF integrated circuits Revision history Rev Date Description v.3 20140813 Application note third release Modifications: Updated Figure 9, Figure 12, Figure 14, Figure 16, and Figure 20. v.2 20140804 Application note second release Modifications: The format of this application note has been redesigned to comply with the new identity guidelines of NXP Semiconductors. Legal texts have been adapted to the new company name where appropriate. SA602 changed globally to SA602A Section 3 The problem: deleted (old) fourth paragraph Section 4 The solution, first paragraph: fifth and sixth sentences rewritten Section 4.1 The mixer, second paragraph, first sentence changed from interference must be correct to impedance/noise match must be optimized Section 4.3 Basic considerations, second paragraph, fourth sentence: changed from (1.5 nominal) to (1.5 k nominal) Figure 18 Oscillator configurations: pin numbers are corrected Section 10 Data demodulation, second paragraph: (old) third sentence replaced with (new) third and fourth sentences. v.1 19970820 Application note first release Contact information For more information, please visit: