Microsemi Corporation GC4713, GC4712, GC4711, GC4702, GC4701 Datasheet

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LIMITER DIODES

DESCRIPTION

The GC4700 series diodes are specially processed PIN diodes designed for use in passive or active limiters at frequencies through Ku band.

Twelve categories of devices are offered for flexibility in design of low (lower Vb, fastest turn-on time), medium and high (highest Vb, slowest turn-on time) power limiters.

			λ	DC BLOCK
	DC BLOCK		4
			COARSE	CLEAN UP
			(HIGH		OUTPUT
	INPUT	DC		(FAST)
			POWER)
		RETURN	LIMITER	LIMITER

DIODE	DIODE
BASIC TWO-DIODE LIMITER

Control Devices

APPLICATIONS

A diode limiter is a power-sensitive variable attenuator that uses the non-linear properties of the diode to provide an impedance mismatch when sufficient amounts of RF power are incident on the device. The output power is reduced to a level that will not overdrive a receiver, burn out a mixer, etc. For varying input power levels in excess of the diode’s threshold level, the limiter’s output power tends to remain constant.

A passive limiter is one in which the limiter diodes are “turned on” by the RF signal itself. An active limiter is one in which the limiter diodes are “turned on” primarily by an external bias current typically supplied by a Schottky detector diode which senses the incident signal.

Since limiter diodes are not designed to dissipate large amounts of power, the limiter must reflect or divert the excess incident power back to the source or to another load (i.e. via a circulator, hybrid coupler, etc.).

Limiter diodes may be used in wave guides, coax, microstrip, stripline or other media. Single or cascaded devices may be used, depending on power levels.

CHIP ELECTRICAL PARAMETERS: TA = 25°C

	VB	CJO	CJ6	TYPICAL	TYPICAL	TYPICAL	MAXIMUM
							2
MODEL	MIN (VOLTS)	TYP	MAX	RS	TL	θP1	THERMAL
NUMBER	IR = 10µA	(pF)	(pF)	@10 mA	(nS)	(°C/W)	RESISTANCE
				(Ohms)			(°C/W)
GC4701	20	0.20	0.15	1.5	5	20	100
GC4702	20	0.50	0.30	1.2	10	12	80
GC4711	45	0.20	0.15	1.5	10	15	80
GC4712	45	0.50	0.30	1.2	15	10	60
GC4713	45	0.70	0.50	1.0	20	6	40
GC4721	120	0.20	0.15	1.5	50	1.2	40
GC4722	120	0.60	0.30	1.0	50	0.5	20
GC4723	120	0.80	0.50	0.5	100	0.3	15
GC4731	15	0.12	0.10	2.0	5	30	120
GC4732	15	0.20	0.15	1.5	5	20	80
GC4741	30	0.12	0.10	2.0	7	20	100
GC4742	30	0.20	0.15	1.5	7	15	70

1)Pulse length 1 microsecond.

2)As measure in style 30 package.

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