xandeyes
Junior Member level 1
![Junior Member level 1](/styles/images/ranks/clevel1.gif)
hello everyone.
i have problem with sensitivity SA615.
my input frequency is 21.4MHz ( modulation 1KHz audio,lever 5.6kHz) and IF = 455KHz . the crystal OSC is 20.945 MHz
I rematching RF input, use ADS simulation and after installation, I measure with VNA , equal S11 = -15dBm ( at 21.4MHz)
the circuit attached below.
But the sensitivity very badly,measure,adjust the inductors and equal = 90uV ( at 12dB SINAD)
I had some experience to adjust IC FM/IF MC3361 ( RF input 21.4MHz , IF 455KHz and sensitivity about 3uV at 12dB SINAD )
therefor I know how to adjust quadrature detector terminal.
the datasheet SA615 show sensitivity achieved 0.22uV and how can I have this value with my RF input???
thanks so much.
// i use ceramic filter is murata cfukf455ka2x-r0
![sa.PNG sa.PNG](https://www.edaboard.com/data/attachments/52/52774-bf654db6f65226b7dd9e68124417cd8c.jpg)
i have problem with sensitivity SA615.
my input frequency is 21.4MHz ( modulation 1KHz audio,lever 5.6kHz) and IF = 455KHz . the crystal OSC is 20.945 MHz
I rematching RF input, use ADS simulation and after installation, I measure with VNA , equal S11 = -15dBm ( at 21.4MHz)
the circuit attached below.
But the sensitivity very badly,measure,adjust the inductors and equal = 90uV ( at 12dB SINAD)
I had some experience to adjust IC FM/IF MC3361 ( RF input 21.4MHz , IF 455KHz and sensitivity about 3uV at 12dB SINAD )
therefor I know how to adjust quadrature detector terminal.
the datasheet SA615 show sensitivity achieved 0.22uV and how can I have this value with my RF input???
thanks so much.
// i use ceramic filter is murata cfukf455ka2x-r0
![sa.PNG sa.PNG](https://www.edaboard.com/data/attachments/52/52774-bf654db6f65226b7dd9e68124417cd8c.jpg)