HMMC-5626 – Broadband Lossy 1:2 Balun

データシート

Description

The TC277 (HMMC-5642) broadband lossy balun converts single-ended input signal into a pair of differential outputs. It has flat broadband differential response, broadband input matching and good output balance at high frequencies. The device is fabricated in HFTC’s HB2B process.

Absolute Maximum Ratings

		Continuous Operation¹		Damage Limit²
Symbol	Parameters / Conditions	Min.	Max.	Min.	Max.	Units
PRF(IN)	CW Input RF power - IN port		16		22	dBm
VDC(IN)	DC voltage – IN Port³	-3.5	3.5	-5	5	V
VDC(OUTN)	DC voltage – OUTN Port	-2	2	-3	3	V
I(VB)	DC current – VB Port	-13.5	13.5	-20	20	mA
Tbs	Operating Chip Backside Temperature		100			degC
Tstg	Storage Temperature			-65	150	degC
Tmax	Maximum Assembly Temperature⁴				150	degC
ESD	Ports: IN, OUTP, VB⁴			-200	200	V
ESD	Port OUTN⁴			-500	500	V

DC Specifications/Physical Properties (TA=25°C)

Symbol	Parameters/conditions	Min.	Nom.	Max.	Units
RDC(VB)	Input resistance – VB Port¹	463	500	543	Ω
RIN(OUTN)	Input resistance – OUTN Port²	48	53.5	59	Ω

Frequency-Domain RD Specifications

(TA=25°C, Zo = 50 Ω, all ports)

Symbol	Parameters/conditions	Min.	Nom.	Max.	Units
Freq	Operating Frequency Range	0		110	GHz
S(IN,IN)	Input Range Loss – 20 GHz		-25.8		dB
	Input Range Loss – 50 GHz		-18.6		dB
S(OUTN,OUTN)	Output Return Loss – Inverting – 5 GHz	-2.0	-1.7	-1.4	dB
	Output Return Loss – Inverting – 30 GHz	-10.4	-9.4	-7.8	dB
	Output Return Loss – Inverting – 50 GHz		-7.7		dB
	Output Return Loss – Inverting – 100 GHz		-9.5		dB
S(OUTN,IN)	Insertion Loss – 2 GHz	-22.4	-21.7	-20.8	dB
	Insertion Loss – 30 GHz	-6.8	-6.1	-5.4	dB
	Insertion Loss – 50 GHz		-7.1		dB
	Insertion Loss – 100 GHz		-10		dB

Applications

The HMMC-5642 broadband lossy balun is designed to be used as a low-cost single-ended to differential converter at the inputs of high-gain, internally matched, differential, limiting amplifiers driven to saturation from a single-ended source. It is particularly useful when the amplifier is used as a differential LO source for balanced mixers. In this application HMMC-5642 improves the output balance of the amplifier resulting in higher conversion efficiency, lower noise and improved isolations.

Device Architecture

The schematic of the HMMC-5642 balun is shown in Figure 1. The series RC sections after the 50 Ω transmission line improve input matching and balance at high frequencies. The inverting output OUTN of the balun is DC terminated with 50 Ω resistor and can be biased/monitored through 475 Ω resistor connected to VB. The output common mode rejection changes from zero at low frequencies to above 20 dB at 50 GHz and above.

Assembly Techniques

InP MMICs are ESD sensitive. ESD preventive measures must be employed in all aspects of storage, handling, and assembly.

MMIC ESD precautions, handling considerations, die attach and bonding methods are critical factors in successful InP MMIC performance and reliability.

Keysight application note #54, “GaAs MMIC ESD, Die Attach and Bonding Guidelines” provides basic information on these subjects.