T80-2 80T #26 Q Measurement

Micrometals Reference Page 19

SimSmith Traces
VNWA S11 Q (Red)	= VNWA S11 Measurement with winding capacitance subtracted
1/(1/Qrs + 1/Qrp) (Yellow)	= Wire RS Q || Core Rp Q
VNWA BW Q Line (Green)	= VNWA Bandwidth Q using 400pF Variable
VNWA BW Q(Black)	= VNWA Bandwidth Q points using 400pF Variable
Ls (Blue)	= VNWA measured Inductance
Lsc (Violet)	= VNWA measured Inductance with Subtracted winding capacitance

VNWA S11 Frequency Range and Resolution

VNWA Bandwidth Frequency Range and Resolution

VNWA Bandwidth Q using 150pF Variable and 120pF C0G
MHz	Capacitor	Q	Rs Ω	Q 400pF	Rs 400pF	Rs Delta
1.592	150 || 120	247	1.46	246	1.47	0.0059
1.768	150 || 120	250	1.60	248	1.62	0.013
1.901	150 || 120	252	1.71	249	1.73	0.021
2.123	150	251	1.92	247	1.95	0.031
2.767	150	241	2.60	233	2.70	0.089

T80-2 80T #26 Q-Curve

Measurement Fixtures

VNWA S11 Fixture

VNWA S11 Measurement
Arbitrary Calibration using Female SDR-Kit BNC Calibration Kit Amphenol 031-5329-52RFX Fixture delay = 26ps Log frequency, 200 points, 20s sweep Measurement is temperature sensitive, Calibrate just before measurement

VNWA 400pF Variable Bandwidth Fixture

VNWA 150pF Variable and 120pF C0G Bandwidth Fixture

Oscilloscope with Capacitive Divider Fixture Q Measurement

AWG set to 1Vrms Oscilloscope Zin = 1MΩ || 16pF 18pF / 120pF capacitive divider using 5% C0G capacitors. Round up Capacitive divider to 18pF / 140pF Ratio = 8.778 Q = 0.5665 * 50 * 8.778 = 249 Error = (255-249) / 255 = 2.4%

Capacitive Divider Fixture Schematic

Oscilloscope Q Measurement SimSmith Model