Local oscillator buffer
AssigneeNordic Semiconductor ASA
InventorsSami Karvonen, Pete Sivonen
Life of this patent
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Abstract
A local oscillator buffer circuit comprises a complementary common-source stage comprising a first p-channel transistor (MCSP) and a first n-channel transistor (MCSN), arranged such that their respective gate terminals are connected together at a first input node, and their respective drain terminals of each of is connected together at a buffer output node. A complementary source-follower stage comprises a second p-channel transistor (MSFP) and a second n-channel transistor (MSFN), arranged such that their respective gate terminals are connected together at a second input node, and their respective source terminals are connected together at the buffer output node.
Claims22
A local oscillator buffer circuit comprising:
- a complementary common-source stage comprising a first p-channel transistor and a first n-channel transistor, arranged such that a respective gate terminal of each of the first p-channel and n-channel transistors are connected together at a first input node, and a respective drain terminal of each of the first p-channel and n-channel transistors are connected together at a buffer output node;
- and
- a complementary source-follower stage comprising a second p-channel transistor and a second n-channel transistor, arranged such that a respective gate terminal of each of the second p-channel and n-channel transistors are connected together at a second input node, and a respective source terminal of each of the second p-channel and n-channel transistors are connected together at the buffer output node.
A radio communication circuit comprising:
- a frequency synthesizer arranged to generate a local oscillator signal comprising a positive local oscillator input signal and a negative local oscillator input signal;
- a local oscillator buffer circuit comprising:
- a complementary common-source stage comprising a first p-channel transistor and a first n-channel transistor, arranged such that a respective gate terminal of each of the first p-channel and n-channel transistors are connected together at a first input node arranged to receive the positive local oscillator input signal, and a respective drain terminal of each of the first p-channel and n-channel transistors are connected together at a buffer output node;
- and
- a complementary source-follower stage comprising a second p-channel transistor and a second n-channel transistor, arranged such that a respective gate terminal of each of the second p-channel and n-channel transistors are connected together at a second input node arranged to receive the negative local oscillator input signal, and a respective source terminal of each of the second p-channel and n-channel transistors are connected together at the buffer output node.
Dependencies are inferred from the claim text.