Travis Newton LO-IF Engineer EVLA LO/IF PDR 22-23 January 2002 1 IF Downconverter Travis Newton LO/IF Engineer.

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Presentation transcript:

Travis Newton LO-IF Engineer EVLA LO/IF PDR January IF Downconverter Travis Newton LO/IF Engineer

Travis Newton LO-IF Engineer EVLA LO/IF PDR January IF Downconverter -Converts 8-12 GHz IF to two 2-4 GHz baseband IF’s for 3-bit, 4GHz sampling -Converts 8-12 GHz IF to one 1-2 GHz baseband IF’s for 8-bit, 2GHz sampling

Travis Newton LO-IF Engineer EVLA LO/IF PDR January IF Downconverter Specifications ITEMSPECIFICATIONNOTES Number of modules 1244 per antenna plus 12 spares Number of IF inputs per module 1 Input frequency range 7.5 – 12.5 GHz

Travis Newton LO-IF Engineer EVLA LO/IF PDR January IF Downconverter Specifications ITEMSPECIFICATIONNOTES Input power level -45 dBm/GHz Variation of power spectral density +/- 1.5 dB Headroom> 20 dB

Travis Newton LO-IF Engineer EVLA LO/IF PDR January IF Downconverter Specifications ITEMSPECIFICATIONNOTES Number of LO per module 32 independently tunable, 1 fixed Frequency range of LO 10.8 – 14.8 GHz, GHz fixed Power level LO +10 dBm

Travis Newton LO-IF Engineer EVLA LO/IF PDR January IF Downconverter Specifications ITEMSPECIFICATIONNOTES Spurious levels of LO <-70 dBc for spurious, < -80 dBc for harmonics related to any reference frequency, <-40 dBc for harmonics

Travis Newton LO-IF Engineer EVLA LO/IF PDR January IF Downconverter Specifications ITEMSPECIFICATIONNOTES Number of IF outputs per module 3 Frequency range of output 2 bands 2-4 GHz 1 band 1-2 GHz Power level of output TBD

Travis Newton LO-IF Engineer EVLA LO/IF PDR January IF Downconverter Specifications ITEMSPECIFICATIONNOTES IF headroom>20 dB LO 2 nd harmonic spur and leakage < -40 dBc IF input VSWR < 1.5:1.0

Travis Newton LO-IF Engineer EVLA LO/IF PDR January IF Downconverter Specifications ITEMSPECIFICATIONNOTES IF input noise figure < 12 dB Image rejection < -25 dBc Overall amplitude flatness 2 dB / 200 MHz avg. slope Smooth variations, no large jumps

Travis Newton LO-IF Engineer EVLA LO/IF PDR January IF Downconverter Specifications ITEMSPECIFICATIONNOTES Phase/delay stability TBD Isolation between channels > 70 dB

Travis Newton LO-IF Engineer EVLA LO/IF PDR January IF Downconverter Specifications ITEMSPECIFICATIONNOTES Total power detector response time TBD Phase linearity 2.8 nsec / any 2 MHz InterfaceTBD M&CTBD

Travis Newton LO-IF Engineer EVLA LO/IF PDR January IF Downconverter Filters: Phase Linearity: < +/- 25  across any 2 GHz Amplitude: 0.5 dB pp Delay matched: < 15  across 80% centered BW Phase  w/ Temp: <20  across BW

Travis Newton LO-IF Engineer EVLA LO/IF PDR January IF Downconverter Variable Attenuators: dB LSB, dB max Phase shift with Attenuation change: +/- 5  to 20 dB +/- 10  to 32 dB, TBD

Travis Newton LO-IF Engineer EVLA LO/IF PDR January IF Downconverter Isolation/Isolators: 4096 MHz LO – 2-4 GHz path: 133 dB in Switch, Isolator, Mixer 2-4 GHz paths: 40 dB in Isolator, Power Divider 2 nd LO #1 – 2 nd LO #2: 100 dB in Isolators, Mixer, Power Divider Output: TBD

Travis Newton LO-IF Engineer EVLA LO/IF PDR January IF Downconverter Total Power Detectors Similar to or same as ALMA 2 ms sampled Servo Attenuators locally (closed loop) or attenuators servoed from MCC TPD and Variable Attenuators possibly served by separate MIB

Travis Newton LO-IF Engineer EVLA LO/IF PDR January IF Downconverter Path 1 Converts 8-12 GHz to 2-4 GHz

Travis Newton LO-IF Engineer EVLA LO/IF PDR January IF Downconverter 8-12 GHz Device 8-12 GHz GainSignal dBm/GHz Noise dBm/GHz Spectral SNR Headroom Input Coax Isolator Attenuator Amplifier

Travis Newton LO-IF Engineer EVLA LO/IF PDR January IF Downconverter 8-12 GHz Device 8-12 GHz GainSignal dBm/GHz Noise dBm/GHz Spectral SNR Headroom Attenuator BP Filter Attenuator Dig. Attn Amplifier

Travis Newton LO-IF Engineer EVLA LO/IF PDR January IF Downconverter 8-12 GHz Device 8-12 GHz GainSignal dBm/GHz Noise dBm/GHz Spectral SNR Headroom Gain Eq Power Div TPD Power Div Isolator

Travis Newton LO-IF Engineer EVLA LO/IF PDR January IF Downconverter 2-4 GHz Device 2-4 GHz GainSignal dBm/GHz Noise dBm/GHz Spectral SNR Headroom Mixer Isolator Attenuator BP Filter Attenuator

Travis Newton LO-IF Engineer EVLA LO/IF PDR January IF Downconverter 2-4 GHz Device 2-4 GHz GainSignal dBm/GHz Noise dBm/GHz Spectral SNR Headroom Amplifier RF Switch

Travis Newton LO-IF Engineer EVLA LO/IF PDR January IF Downconverter 2-4 GHz Device 2-4 GHz GainSignal dBm/GHz Noise dBm/GHz Spectral SNR Headroom Attenuator Amplifier

Travis Newton LO-IF Engineer EVLA LO/IF PDR January IF Downconverter 2-4 GHz Device 1-4 GHz GainSignal dBm/GHz Noise dBm/GHz Spectral SNR Headroom RF Switch Attenuator LP Filter Attenuator Amplifier

Travis Newton LO-IF Engineer EVLA LO/IF PDR January IF Downconverter 2-4 GHz Device 1-4 GHz GainSignal dBm/GHz Noise dBm/GHz Spectral SNR Headroom Attenuator BP Filter Attenuator Dig. Attn Amplifier

Travis Newton LO-IF Engineer EVLA LO/IF PDR January IF Downconverter 2-4 GHz Device 1-4 GHz Gain dB Signal dBm/GHz Noise dBm/GHz Spectral SNR Headroom dB Power Div TPD Amplifier Out to Sampler

Travis Newton LO-IF Engineer EVLA LO/IF PDR January IF Downconverter Path 2 Converts 8-12 GHz to 1-2 GHz

Travis Newton LO-IF Engineer EVLA LO/IF PDR January IF Downconverter 8-12 GHz Device 8-12 GHz GainSignal dBm/GHz Noise dBm/GHz Spectral SNR Headroom Input Coax Isolator Attenuator Amplifier

Travis Newton LO-IF Engineer EVLA LO/IF PDR January IF Downconverter 8-12 GHz Device 8-12 GHz GainSignal dBm/GHz Noise dBm/GHz Spectral SNR Headroom Attenuator BP Filter Attenuator Dig. Attn Amplifier

Travis Newton LO-IF Engineer EVLA LO/IF PDR January IF Downconverter 8-12 GHz Device 8-12 GHz GainSignal dBm/GHz Noise dBm/GHz Spectral SNR Headroom Gain Eq Power Div TPD Power Div Isolator

Travis Newton LO-IF Engineer EVLA LO/IF PDR January IF Downconverter 2-4 GHz Device 2-4 GHz GainSignal dBm/GHz Noise dBm/GHz Spectral SNR Headroom Mixer Isolator Attenuator BP Filter Attenuator

Travis Newton LO-IF Engineer EVLA LO/IF PDR January IF Downconverter 2-4 GHz Device 2-4 GHz GainSignal dBm/GHz Noise dBm/GHz Spectral SNR Headroom Amplifier RF Switch

Travis Newton LO-IF Engineer EVLA LO/IF PDR January IF Downconverter 1-2 GHz Device 1-2 GHz GainSignal dBm/GHz Noise dBm/GHz Spectral SNR Headroom Isolator Mixer Isolator BP Filter Amplifier

Travis Newton LO-IF Engineer EVLA LO/IF PDR January IF Downconverter 1-2 GHz Device 1-4 GHz GainSignal dBm/GHz Noise dBm/GHz Spectral SNR Headroom RF Switch Attenuator LP Filter Attenuator Amplifier

Travis Newton LO-IF Engineer EVLA LO/IF PDR January IF Downconverter 1-2 GHz Device 1-4 GHz GainSignal dBm/GHz Noise dBm/GHz Spectral SNR Headroom Attenuator BP Filter Attenuator Dig. Attn Amplifier

Travis Newton LO-IF Engineer EVLA LO/IF PDR January IF Downconverter 1-2 GHz Device 1-4 GHz Gain dB Signal dBm/GHz Noise dBm/GHz Spectral SNR Headroom dB Power Div TPD Amplifier Out to Sampler