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You misunderstand what I mean. The bias voltage is 2.5 V. The input voltage is from 3.0~2.0, so the dynamic range is +0.5(3.0-2.5) ~ -0.5(2.0-2.5)<p> <blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>Originally posted by cato: Your input voltages a...

I got new problems in AD9057.<p>1. I use OSC to measure the bias voltage of AD9057. I got 2.5~2.48 in two boards, and got 2.525 ~ 2.523 in another two boards. Meanwhile, the sensitivity of 2.5~2.48 is -30dbm that is better than 2.525~2.523 that is -18dbm sensitivity. Is it reasonable? What kind reas...

The digital output of AD converter is directly connected to the FPGA input. There is no test pins connect out. So, I am not sure whether the variation of digital out corresponds to the analog input, ideally. In layout issue, I have seperated both power and ground plains to analog and digital parts. ...

I was invloved in implementing BPSK decoder. The structure of circuit is like as following description. BPSK --> AD9057 (8 bits) --> FPGA The FPGA can retrieve the base band date only if digital out has 1 bit variant. So, there is 1/256=-44dbm sensitivity, ideally. But, unfortunately, the system onl...

I 'd like to design a receiver that can trace the signal was emitted by the transimitter. If I put a transimitter in a mobil stuff(like people or car), and transimitter emits the signal regularly. The receiver can trace the signal from transimitter, and estiminates the distance and direction(positio...

I am designing a reciver that has to prevent the over power from antenna.
I need a limiter that puts in the front end.
And that can keep the input signal at -60dbm as maximan input.
Does anyone have such experience?

I use RLC meter to measure the impedance of analog input of AD9057. Because the input bandwidth is from 32MHZ to 48MHZ, i measure 101-240j(32MHZ), 69-206j(40MHZ), 50-173j(48MHZ), respectively. I'd like to design a match circuit that can transfer input impedance at all bandwidth(32-48MHZ) to ideal 50...

indeed, there is a pair of diodes embeded in AD9057 in front of analog input.
But, in the real situation, the output is not correct when the input signal is over voltage (about 2-3Vpp).

I am looking for a diode that works at hi freqency(40mhz).
I'd like to put it in front of analog input pin of AD9057 to limit the input voltage.
Does anybody can tell me? which brand? and model NO.?

I live in Taiwan.
But, I'd like to know the situation in other countries.

Does anybody know what are the frequency band of ISM?
There is a 800MHZ transmitter circuit, that use 800 MHZ band.
But, Is it leagal band for amateur hobbyist.

I got a problem while implementing BPSK decoder.
Please refer to the description of my question.
http://user52.starbeta.org/others/ad9057q.pdf<p>AD9057'S spec. is refering to
http://user52.starbeta.org/others/ad9057_d.pdf

I already found the answer in my problem. I use a RCL meter to measure the impedance of analog input, and I got the real input impedance. Then refering to the real impedance, I design a match circuit. Finally, the sesitivity is amazingly up 10db,(-25dbm to -35dbm).<p>I wonder why the datasheet doesn...

I am using a AD converter. http://user52.starbeta.org/others/ad9057_d.pdf I found on the page 10, there is a reference application circuit. The R1 is 50(OHM), and C2 is 0.1(uF). I supposed it is NOT right because of the Input resistance is 150KOHM, and Input capacitance is 2pf depands on the Analog ...

I calculate the power of resolution. dynamic range = 1 Vpp 8 Bits resolutions = 255 status resolution of Vpp = 1/255 = 4mVpp 4Vpp = -43.9dbm BUT, In the practical circuit experiment. The resolutoin is -22 dbm. So, there are about 20dbm that have gone. Does it noise issue? Is it reasonable? What can ...