TDA5744 Datasheet, PDF (9/20 Pages) NXP Semiconductors – Low power mixers/oscillators for hyperband tuners

Philips Semiconductors
Low power mixers/oscillators for
hyperband tuners
TEST AND APPLICATION INFORMATION
Preliminary specification
TDA5744; TDA5745
handbook, full pagewidth
signal
50 Ω source
VHFIN IFOUT1
e
Vmeas V
50 Ω
Vi
D.U.T.
Vo
IFOUT2
RMS
voltmeter
T
(1)
N1
C
(2)
N2
V'meas
spectrum
analyzer
50 Ω
MGK828
(1) N1 is 2 × 5 turns.
(2) N2 is 2 turns.
The gain is defined as the transducer gain plus the voltage transformation ratio (T_loss) of the transformer.
Z_i >> 50 Ω ⇒ V_i = 2 × V_meas; V_i = 80 dBµV.
V_o = V’_meas + 16 dB (transformer ratio ^NN-----12-- = 5 and transformer loss); G_V = 20 log -VV----^o-_i
Fig.4 Voltage gain (G_V) measurement in the VHF band.
signal
handbook, full pagew₅id₀th_{Ω source}
A
C
e
Vmeas V
50 Ω ^{Vi HYBRID}
RMS ^{50 Ω}
voltmeter
B
D
UHFIN1 IFOUT1
D.U.T.
Vo
UHFIN2 IFOUT2
T
(1)
N1
C
(2)
N2
V'meas
spectrum
analyzer
50 Ω
MGK829
(1) N1 is 2 × 5 turns.
(2) N2 is 2 turns.
The gain is defined as the transducer gain plus the voltage transformation ratio (T_loss) of the transformer.
V_i = V_meas; V_i = 70 dBµV.
V_o = V’_meas + 16 dB (transformer ratio ^NN-----12-- = 5 and transformer loss); G_v = 20 log -VV----^o-_i + 1 dB (1 dB = correction for hybrid loss).
Fig.5 Voltage gain (G_V) measurement in the UHF band.
1998 Mar 09
9