dBm ↔ VOPP

Type dBm or VOPP — the other updates. PNA port is 50 Ω; set Z_DUT for the device at the plane.

Z_PNA 50 Ω port, fixed

Z_DUT Ω

PNA drives DUT

Source PNA stimulus Z_PNA 50 Ω

Load DUT SE input Z_DUT 50 Ω

Port 1

0.00 dBm

Z₀ 50 Ω · matched

RF in

Available 1 mW

VOPP 0.632 V

Source power available

dBm

VOPP (SE pk-pk) type to solve dBm

Assumptions

Z_PNA is fixed at 50 Ω (analyzer port). Z_DUT is the DUT impedance at that plane (per side if differential).
PNA → DUT: dBm is available source power. VOPP is the loaded voltage at the DUT. Type VOPP to get the PNA source setting.
DUT → PNA: dBm is delivered receiver power. VOPP is the voltage at the PNA port (same node as the DUT output if connected directly). Type VOPP to get the receiver reading.
Real impedances. V_load = 2√(P_avs Z_S) · Z_L / (Z_S + Z_L).
Differential: complementary 180°. VOPP is V₊ − V₋. Z_diff = 2 · Z (per side).

Formulas

Γ = (Z_L − Z_S) / (Z_L + Z_S)
V_oc = 2 √(P_avs · Z_S)
V_rms = V_oc · Z_L / (Z_S + Z_L)
VOPP = 2√2 · V_rms (sine)
PNA→DUT: Z_S=Z_PNA, Z_L=Z_DUT, dBm = P_avs
DUT→PNA: Z_S=Z_DUT, Z_L=Z_PNA, dBm = P_del

Arrow up/down on dBm steps 1 dB. Hold Shift for 0.1 dB.

Quick reference

50 Ω, CW sine

dBm / port	SE VOPP	Diff VOPP	Delivered

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