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Prevent higher frequency output spike when sweep starts at DC

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This commit is contained in:
Jan Käberich 2022-06-06 17:28:03 +02:00
parent 8688a405e7
commit 0cecaf72e5
2 changed files with 11 additions and 5 deletions
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12
Software/VNA_embedded/Application/VNA.cpp
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@ -404,12 +404,18 @@ void VNA::SweepHalted() {
}
// need the Si5351 as Source
Si5351.SetCLK(SiChannel::LowbandSource, frequency, Si5351C::PLL::B, driveStrength);
bool freqSuccess = Si5351.SetCLK(SiChannel::LowbandSource, frequency, Si5351C::PLL::B, driveStrength);
static bool lowbandDisabled = false;
if (pointCnt == 0) {
// First point in sweep, enable CLK
Si5351.Enable(SiChannel::LowbandSource);
// First point in sweep, switch to correct source
FPGA::Disable(FPGA::Periphery::SourceRF);
lowbandDisabled = true;
}
if(lowbandDisabled && freqSuccess) {
// frequency is valid, can enable lowband source now
Si5351.Enable(SiChannel::LowbandSource);
Delay::us(1300);
lowbandDisabled = false;
}
// At low frequencies the 1.LO feedthrough mixes with the 2.LO in the second mixer.