TDA5745 查看數據表（PDF） - Philips Electronics

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TDA5745

Low power mixers/oscillators for hyperband tuners

Philips Electronics 

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 (Tloss) of the transformer.

Zi >> 50 Ω ⇒ Vi = 2 × Vmeas; Vi = 80 dBµV.

Vo = V’meas + 16 dB (transformer ratio NN-----12-- = 5 and transformer loss); GV = 20 log -VV----o-i

Fig.4 Voltage gain (GV) measurement in the VHF band.

signal

handbook, full pagew5id0thΩ 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 (Tloss) of the transformer.

Vi = Vmeas; Vi = 70 dBµV.

Vo = V’meas + 16 dB (transformer ratio NN-----12-- = 5 and transformer loss); Gv = 20 log -VV----o-i + 1 dB (1 dB = correction for hybrid loss).

Fig.5 Voltage gain (GV) measurement in the UHF band.

1998 Mar 09

9

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