Low additional phase shift attenuator

The invention relates to a low additional phase shift attenuator, which comprises an active amplification module, a transconductance enhancement module, a gain tuning module, a low frequency gain compensation module and a passive attenuation module, and is characterized in that the transconductance enhancement module and the gain tuning module are both connected to the active amplification module; and the active amplification module, the low-frequency gain compensation module and the passive attenuation module are connected in sequence. The passive attenuation module is arranged between the output end and the active amplification module, so that output matching is facilitated, an active and passive combined structure is adopted, the advantages of the two structures can be combined, the insertion loss is reduced, and the attenuation range is widened. On the basis of a cascode amplification structure, the digital control common-gate transistor is adopted for gain control, and the complementary control common-ga