• AD8345 IC Usage for OQPSK Modulation

    Hello, 

    We are currently designing a ground-to-satellite communication system by OQPSK (Offset Quadrature Phase Shift Keying) modulation. As you know, in comparison to QPSK modulation, Q-channel data shall be delayed by time of Tb in OQPSK with the respect…

  • AD8345 Pout vs. Vinbb Transfer Function

    Question: Why does is the transfer function of the AD8345 (SSB Pout vs. Baseband Differential Input Voltage) not a straight line? Shouldn't the gain of the device be constant vs. input level.  Also as the baseband input level doubles from 0.5Vpp…

  • RE: AD8345 I/Q Modulator Instability

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    Thank you,
    …

  • RE: AD8345/6/9 (+simple DAC) acting as phase shifter

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    Thank you,
    …

  • RE: Does LO input on AD8345 drive the RF frequency of the output?

    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

    Thank you,
    …

  • Baseband phase error problem about AD8345

    Hi,

    I am using a custom AD8345 board to generate SSB signals.

    The IQ frequency I want is about a few kHz to a few tens of kHz. I use 15 kHz as the test frequency.

    If I drive the IQ inputs in quadrature, the output sideband rejection is rather poor…

  • AD8348 I/Q outputs driving AD8345

    Can the AD8348 baseband outputs, with 2K minimum load impedance specified, directly drive the high impedance I and Q inputs of the AD8345?

  • AD9777: Modulating the bandwidth

    Q 

    I would like to know if is it possible to use AD9777's Direct-IF option so that
    DAC signal output would be 100-120 MHz (communication signal bandwidth)? This
    would be achieved by upconverting 30-50 MHz band with 70 MHz (Direct-IF?)
    inside…

  • AD8132: Best way to drive baseband inputs, improve LO leakage

    Q 

            1. The data sheet is specificity for a Vout = 2 Vp-p, I suppose that
    Vout=Vocm, then if I'll want to have 2 Vp-p at out, I'll must drive 2Vp-p at
    the Vocm input. But I don't know what is the value of -IN and +IN inputs.

    …

  • FAQ: Can AD8346 be operated at frequencies below 800 MHz?

    Question: FAQ: Can AD8346 be operated at frequencies below 800 MHz?

    Answer: For starters, there is only one good reason to try and use the AD8346 at frequencies below its specified 800 MHz minimum. And that reason is the fact that the device has…