A transmission device comprising: a first amplifier being a differential amplifier of a common source structure and comprising cross coupled capacitors, and configured to amplify an input signal; a second amplifier being a differential amplifier of a common gate structure configured to amplify a signal outputted from the first amplifier ; and a harmonic termination unit connected to output terminals of the first amplifier and input terminals of the second amplifier , and configured to terminate at least a portion of a second harmonic, wherein the harmonic termination unit is configured to offset at least a portion of parasitic capacitance generated at the output terminals of the first amplifier and the input terminals of the second amplifier , with respect to a fundamental frequency, and to ground a signal having a frequency of the second harmonic, with respect to the frequency of the second harmonic, wherein the harmonic termination unit consists in a first inductor (332-1), a second inductor (332-2), and a capacitor , wherein one end of the first inductor (332-1) is connected to one of the output terminals of the first amplifier and one of the input terminals of the second amplifier , wherein one end of the second inductor (332-2) is connected to the other one of the output terminals of the first amplifier and the other one of the input terminals of the second amplifier , wherein the other ends of the first inductor (332-1) and the second inductor (332-2) are connected with each other and are connected with one end of the capacitor , and wherein the other end of the capacitor is grounded. a first amplifier being a differential amplifier of a common source structure and comprising cross coupled capacitors, and configured to amplify an input signal; a second amplifier being a differential amplifier of a common gate structure configured to amplify a signal outputted from the first amplifier ; and a harmonic termination unit connected to output terminals of the first amplifier and input terminals of the second amplifier , and configured to terminate at least a portion of a second harmonic, wherein the harmonic termination unit is configured to offset at least a portion of parasitic capacitance generated at the output terminals of the first amplifier and the input terminals of the second amplifier , with respect to a fundamental frequency, and to ground a signal having a frequency of the second harmonic, with respect to the frequency of the second harmonic, wherein the harmonic termination unit consists in a first inductor (332-1), a second inductor (332-2), and a capacitor , wherein one end of the first inductor (332-1) is connected to one of the output terminals of the first amplifier and one of the input terminals of the second amplifier , wherein one end of the second inductor (332-2) is connected to the other one of the output terminals of the first amplifier and the other one of the input terminals of the second amplifier , wherein the other ends of the first inductor (332-1) and the second inductor (332-2) are connected with each other and are connected with one end of the capacitor , and wherein the other end of the capacitor is grounded. <EOS>