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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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4
Software/VNA_embedded/.settings/stm32cubeide.project.prefs
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@ -1,5 +1,5 @@
2F62501ED4689FB349E356AB974DBE57=EF826FD321FB312AEADE4DB74B81458C 2F62501ED4689FB349E356AB974DBE57=6F84FD31C089E822CF61FFCABCD0B7D1
66BE74F758C12D739921AEA421D593D3=2 66BE74F758C12D739921AEA421D593D3=2
8DF89ED150041C4CBC7CB9A9CAA90856=EF826FD321FB312AEADE4DB74B81458C 8DF89ED150041C4CBC7CB9A9CAA90856=6F84FD31C089E822CF61FFCABCD0B7D1
DC22A860405A8BF2F2C095E5B6529F12=6E2D4146EA2709ED1E4A1764BC291F57 DC22A860405A8BF2F2C095E5B6529F12=6E2D4146EA2709ED1E4A1764BC291F57
eclipse.preferences.version=1 eclipse.preferences.version=1

12
Software/VNA_embedded/Application/VNA.cpp
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@ -404,12 +404,18 @@ void VNA::SweepHalted() {
} }
// need the Si5351 as Source // 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) { if (pointCnt == 0) {
// First point in sweep, enable CLK // First point in sweep, switch to correct source
Si5351.Enable(SiChannel::LowbandSource);
FPGA::Disable(FPGA::Periphery::SourceRF); 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); Delay::us(1300);
lowbandDisabled = false;
} }
// At low frequencies the 1.LO feedthrough mixes with the 2.LO in the second mixer. // At low frequencies the 1.LO feedthrough mixes with the 2.LO in the second mixer.