TDA6405ATS datasheet(17/32 Pages) PHILIPS

17 / 32 page

1999 Jan 13

Philips Semiconductors

Product speciﬁcation

5 V mixer/oscillator-PLL synthesizers for

hyperband tuners

TDA6404; TDA6405;

TDA6405A

Fig.8 Input circuit for optimum noise figure in the VHF band.

(a) For fRF = 50 MHz:

VHF mixer frequency response measured = 57 MHz;

loss = 0 dB.

Image suppression = 16 dB.

C1 = 9 pF; C2 = 15 pF.

L1 = 7 turns (Ø 5.5 mm; wire Ø = 0.5 mm).

I1 = semi rigid cable (RIM): 5 cm long.

(semi rigid cable (RIM); 33 dB/100 m; 50

Ω; 96 pF/m).

(b) For fRF = 150 MHz:

VHF mixer frequency response measured = 150.3 MHz;

loss = 1.3 dB.

Image suppression = 13 dB.

C3 = 5 pF; C4 = 25 pF.

I2 = semi rigid cable (RIM): 30 cm long.

I3 = semi rigid cable (RIM): 5 cm long

(semi rigid cable (RIM); 33 dB/100 m; 50

Ω; 96 pF/m).

handbook, full pagewidth

MBE286 - 1

PCB

plug

BNC

RIM-RIM

PCB

RIM-RIM

(a)

(b)

F=Fmeas − loss (of input circuit) (dB).

Fig.9 Noise figure (F) measurement in the VHF band.

handbook, full pagewidth

MGL277

VHFIN IFOUT1

IFOUT2

D.U.T.

NOISE

SOURCE

NOISE

FIGURE

METER

BNC

RIM

INPUT

CIRCUIT

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