A Miniaturized Marchand Balun in CMOS With Improved Balance for Millimeter-Wave Applications

• The analysis and design of a millimeter-wave passive balun on silicon substrate with small size and good balance is presented. The reason for the imbalance of the balun is analyzed and a novel method using two grounded T bars beneath the coupled lines to tune the balance is proposed. The balun was fabricated in a 65 nm CMOS process, by using broadside coupled lines with small separation, the length of balun is reduced, resulting in a size of only 0.01 mm$^{2}$. In the 57–67 GHz band, the measured amplitude imbalance is less than 0.5 dB and the phase imbalance is less than 1 $^{circ}$. This method for optimizing the imbalance of balun is efficient and it does not increase the size of balun.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)

Nyckelord

Broadside coupled line

CMOS

Marchand balun

millimeter-wave

imbalance

Publikations- och innehållstyp

art (ämneskategori)

ref (ämneskategori)