MC1496, MC1496B

http://onsemi.com

5

Bias currents flowing into Pins 1, 4, 8 and 10 are transistor

base currents and can normally be neglected if external bias

dividers are designed to carry 1.0 mA or more.

Transadmittance Bandwidth

Carrier transadmittance bandwidth is the 3.0 dB bandwidth

of the device forward transadmittance as defined by:

g21C+

io (each sideband)

vs (signal)

o + 0

Signal transadmittance bandwidth is the 3.0 dB bandwidth

of the device forward transadmittance as defined by:

g21S+

io (signal)

Vc + 0.5 Vdc, Vo + 0

Coupling and Bypass Capacitors

Capacitors C1 and C2 (Figure 5) should be selected for a

reactance of less than 5.0

W at the carrier frequency.

Output Signal

The output signal is taken from Pins 6 and 12 either

balanced or single−ended. Figure 11 shows the output levels

of each of the two output sidebands resulting from variations

in both the carrier and modulating signal inputs with a

single−ended output connection.

Negative Supply

current sources.

Signal Port Stability

Under certain values of driving source impedance,

oscillation may occur. In this event, an RC suppression

network should be connected directly to each input using

short leads. This will reduce the Q of the source−tuned

circuits that cause the oscillation.

Signal Input

(Pins 1 and 4)

510

10 pF

An alternate method for low−frequency applications is to

insert a 1.0 k

W resistor in series with the input (Pins 1, 4). In

this case input current drift may cause serious degradation

of carrier suppression.

NOTE:

Shielding of input and output leads may be needed

to properly perform these tests.

Figure 5. Carrier Rejection and Suppression

Figure 6. Input−Output Impedance

Figure 7. Bias and Offset Currents

Figure 8. Transconductance Bandwidth

0.01

mF

2.0 k

−8.0 Vdc

I6

I9

1.0 k

I7

I8

6.8 k

+

I9

3

3.9 k

12 Vdc

8

C1

0.1

mF

MC1496

1.0 k

2

1.0 k

0.1

mF

51

10 k

Modulating

Signal Input

Carrier

Input

Carrier Null

51

51

10 k

50 k

R1

3.9 k

I6

I4

6

14

5

12

−

2

3

0.5 V

8

10

I1

4

1

10

1

6

4

14

5

12

6.8 k

I10

I5

−8.0 Vdc

1.0 k

MC1496

MC1496

MC1496

6

14

5

12

I10

6.8 k

−8.0 Vdc

12 Vdc

2

3

1.0 k

Modulating

Signal Input

Carrier

Input

0.1

mF

0.1

mF

1.0 k

51

1.0 k

14

5

6

12

1.0 k

23

12 Vdc

2.0 k

6.8 k

10 k

Carrier Null

51

10 k

50 k

−8.0 Vdc

50 50

8

10

4

1

8

10

4

1

51

TEST CIRCUITS